5.3 bogging/stumbling - LS1TECH - Camaro and Firebird Forum Discussion

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5.3 bogging/stumbling

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Old 01-06-2017, 05:01 PM
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Unhappy 5.3 bogging/stumbling

What's up guys ? Been lurking for a minute trying to soak up information, but I'm at a dead end at the moment with my swap. I have a 5.3 with a 670 holley on it and every time I accelerate from a red light or stop and go it stumbles like it wants to die. The carb was sitting up awhile. So, i put in new gaskets, float, accelerator pump, and a bigger squirter (31). I did notice the other day once the car gets warm up it stumbles just a little bit but not to the point I'm going 5 mph waiting for it to go. ????

Stock 5.3/LM7
MSD 6014 LS1 timing selected
TH350
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Old 01-06-2017, 08:38 PM
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Is it stumbling while getting on the gas hard or gradually getting on the gas? What is you fuel level set at and fuel pressure?
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Old 01-07-2017, 01:31 AM
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stumbling while gradually getting on the gas like just trying to cruise. I got the regulator set at 6 psi
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Old 01-07-2017, 01:31 AM
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Its a walbro pump inline.
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Old 01-07-2017, 10:09 PM
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Do you have a afr gauge? I assume not, but I would recommend one.

I'd make sure that the float level is right first. Do you have a MAP sensor hooked up? Make a reference mark on the balancer for any one of the cylinders and use a timing light just to see if it's advancing properly.

I am currently tuning a stock 5.3 as well, and in order to get it right I had to use the #35 squirter and the blue cam, needs a really aggressive shot, but right now this most likely wouldn't help if you're only gradually accelerating. Does aggressively accelerating make the problem disappear, or get worse?
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