Originally Posted by zblee

stock engine - longtube headers. Just got a new transmission and high stall torque converter installed and the day after I picked it up from the shop - this started happening. I think it was a coincidence and also it is starting to get colder now which i believe is making it worse. After cleaning the MAF (didnt look dirty) and the TB (was dirty) it ran fine and did not idle rough at all. A few days later and it still does not idle rough but sometimes it does fluctuate in idle (not stable - goes from 1k down to 500 or lower and back up to 1k) . I strongly believe it is an intake gasket but do not know for sure. I had been messing with the VE , MAF , and timing with HPtuners but after it started acting up I put it back to the stock tune to eliminate the idea that I messed something up, but still is happening...

I am hoping to do a cam/head swap around xmas time and part of this will be new intake gaskets so I think I may just hold out until then to change my gaskets. I was hoping to get this resolved before doing the cam/heads so that I know it was running good before the swap(s). i didnt want to get new intake gaskets and then have to replace them in just 3 weeks - i dont think its advisable to reuse intake gaskets?

thanks
_Zblee

Originally Posted by 1FastBrick

Was the rubber flat to the plastic on the old gaskets?

If so that was your issue.

Originally Posted by Wolftrk99

Did you have it tuned after the headers were put on?? That can mess with fuel trims and create odd misfires etc and set weird codes too.... Chances are gaskets were flattened or distorted though