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

Post header install probs.

Old Apr 7, 2006 | 12:32 PM
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Default Post header install probs.

OK so I have posted on other baords with no solvation. Now I am asking you guys for help.

I installed a set of pacesetter mids on my 94 formula. I am having 2 problems one being more important to solve than the other.

When driving the car "bucks" like it is missing but at idle it idles FINE with the exception of a surge. Here is a vid of the surge to show what it is doing http://videos.streetfire.net/video/F...BE00C03F02.htm .

Now more about the "bucking" I have checked all the plugs and they are fine. The wires are also fine. So what could be causing this? We came to a conclusion that it may ba a vacuum leak but WHERE?? I have tightened up all hoses and the EGR is tight (not sure if it sealed COMPLETELY but yeah.

PLEASE HELP!!!!!!!!! I want my car back to normal.
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Old Apr 7, 2006 | 12:43 PM
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the bucking is probably spark jump...when you install aftermarket headers its known for doing this because the header is straight rather than it dipping up, high temp wire fixes it, you need 600+ degree
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Old Apr 7, 2006 | 02:48 PM
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LT4 knock module maybe?

bad o2 sensors?
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