LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Need Misfire Help.

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Old Nov 7, 2007 | 08:34 AM
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AnniversaryZ28's Avatar
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From: Chicago
Need Misfire Help.

Okay, so last friday i got my pacesetter longtubes installed. Boy, that was fun.

Anyways, the first problem i notice right away is i have the abs inop light and the traction control light on, but no brake light. We did not even touch those items.

Second, the car will run like a champ for the first few minutes, then it will start to idle rough and be very sluggish. If i let it cool down for a ffew hours same deal, runs great till warm, then bad.

When i had it scanned, i got the usual from a header install.

Secondary injection missing(i removed)
Random Misfire code
And a code for both rear o2's(which are now gone of course)

It seems to me since it is fine at first, the o2's are causing it. The PCM does not use the front o2's for open loop right? If that were the case, shouldn't i get a code for the fronts?

I extended the wires with the pacesetter kit, could that be the problem? Again, if that was the problem, i assume i would be getting a code.

Please help
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