LT1-LT4 Modifications 1993-97 Gen II Small Block V8

car "surges" at WOT

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Old Mar 9, 2011 | 06:48 PM
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Default car "surges" at WOT

i recently dropped the k-member and motor/trans out my car to change the head gasket. after reinstalling the k-member and engine/trans i got everything back in its place and now the car kinda jumps at WOT around 3500 RPM. i checked all my vacuum lines, wiring plugs, etc. any ideas? i just bought the car but from the one time i drove it before i dropped the motor i dont remember it surging like this.

any advice?
what to look for?
need more info let me know what u need!!

also idk if i have a SES light on the guy i bought it from pulled the bulb or it went out. (im sure it has one on though, gonna try to get a scan tool this weekend just wanted some input)

thx in advance!!!
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Old Mar 9, 2011 | 06:49 PM
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also put new spark plugs and harmonic balencer in the car. sprayed around all vacuum lines and intake with parts cleaner to see if i had any leaks and didnt notice any!
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Old Mar 9, 2011 | 06:52 PM
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Need more info on the engine itself. is it stock or not? cammed ect
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Old Mar 9, 2011 | 06:54 PM
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man mine does the same thing! ever since a header install. Only at like 5500+ i don't think its a misfire right? Surging is the best way to describe it. I will post a video on it soon to see if yours is the same thing. It did it with old Opti as well. On my car, i fired the ignition wire leading from icm to coil then i just wraped them together and taped it. i am going to sauder them once i get my car back for the transmission shop this weekend. Did you ever have any ignition problems like that?
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Old Mar 9, 2011 | 07:05 PM
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Originally Posted by 96TransAmboosted
Need more info on the engine itself. is it stock or not? cammed ect
mods=CAI, gutted cat, magna flow catback (this is what i know of, as i said i just bought the car)

Originally Posted by LT1John
man mine does the same thing! ever since a header install. Only at like 5500+ i don't think its a misfire right? Surging is the best way to describe it. I will post a video on it soon to see if yours is the same thing. It did it with old Opti as well. On my car, i fired the ignition wire leading from icm to coil then i just wraped them together and taped it. i am going to sauder them once i get my car back for the transmission shop this weekend. Did you ever have any ignition problems like that?
na no ignition problems, ill try to get a video myself of the RPM gauge
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Old Mar 9, 2011 | 07:39 PM
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Normally, surging is caused by a lean condition. I'd tape a fuel pressure guage to the windshield and go mat it a few times. If the pressure drops off under load, you need either a pump or a filter.
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Old Mar 9, 2011 | 07:52 PM
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good to know
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Old Mar 9, 2011 | 08:00 PM
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Originally Posted by 05HD
Normally, surging is caused by a lean condition. I'd tape a fuel pressure guage to the windshield and go mat it a few times. If the pressure drops off under load, you need either a pump or a filter.
gonna try this tomorrow! what should the pressure be around???
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Old Mar 12, 2011 | 08:31 PM
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i did notice the car only does it when its at operating temps. on first start up the car seems to run fine.

(Bump)
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Old Mar 12, 2011 | 08:51 PM
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43ish @ WOT is where it should be. What was yours?
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Old Mar 13, 2011 | 09:15 AM
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Originally Posted by 05HD
43ish @ WOT is where it should be. What was yours?
i didnt have time to check the FP last night i was just going for a lil ride before i left for kentucky for work. when i get back i should have the rest of my parts to do my 6.0 swap but i would still like to resolve the problem for when i sell the LT1
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Old Mar 13, 2011 | 10:01 AM
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What are you going to ask for the long/short block?
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Old Mar 13, 2011 | 08:47 PM
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Originally Posted by 96TransAmboosted
What are you going to ask for the long/short block?
im actually giving the LT1 to a buddy of mine to drop in his 2 door 4WD tahoe.
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Old Mar 19, 2011 | 10:13 PM
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You ever figure out your problem?
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