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

Do I need a tune?

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Old Apr 1, 2007 | 12:03 PM
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Default Do I need a tune?

Alright, 388 stroker, stock injectors but before I was running all stock fuel system and car ran fine. I put a stock coil because the MSD went out. Then I added 255LPH WALBRO FUEL PUMP and now my car seems to act like its either missing or its running too rich. Changing the fuel pump, will this make it run rich even without a tune? The car is untuned but had the injectors bumped up to 26# and now the car not sure whats going on. New opti and wires too.

Think putting the High Performance fuel pump is putting out more PSI or something and running too rich????????
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Old Apr 1, 2007 | 12:06 PM
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i have the same pump and i ran it on stock tune and never had a problem.....
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Old Apr 1, 2007 | 12:22 PM
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Originally Posted by Mike96z
Alright, 388 stroker, stock injectors but before I was running all stock fuel system and car ran fine. I put a stock coil because the MSD went out. Then I added 255LPH WALBRO FUEL PUMP and now my car seems to act like its either missing or its running too rich. Changing the fuel pump, will this make it run rich even without a tune? The car is untuned but had the injectors bumped up to 26# and now the car not sure whats going on. New opti and wires too.

Think putting the High Performance fuel pump is putting out more PSI or something and running too rich????????
So your running stock injectors or are you running 50lb injectors? I was looking at your user cp! I suggest gettin it tuned. Get it dynoed and check the Air/Fuel Ratio. Cause you don't know if its running real lean or running rich. Just my 2 cents.
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Old Apr 1, 2007 | 12:43 PM
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Yea stock injectors etc. It is just running really sluggish. I got it up to 120 though, but when I put it in 6th gear on the highway it kinda shakes and **** like if it was missing or running too rich and not burning the fuel cuz its flooding the plugs.

I had a 360 ci LT1 before but then I went to a 388 but the 360 was tuned for the cam only put boosted the injectors to 26 so maybe the pump wasnt putting out but not it is so its flooding. Not sure.
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Old Apr 1, 2007 | 01:08 PM
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NVM just looked at the damn car, somehow, dont know how, the #8 plug wire isnt even on the car, somehow it came off, this explains the sluggishness. Thanks
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Old Apr 1, 2007 | 01:18 PM
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Originally Posted by Mike96z
NVM just looked at the damn car, somehow, dont know how, the #8 plug wire isnt even on the car, somehow it came off, this explains the sluggishness. Thanks
Glad you found your problem!
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