I got my car tuned at Turbo Trix the other day (got it up to 310 whp ). The idle of the car has been pretty unstable since. But it seems like it has gotten worse. It fluctuates from about 600 up to 2000 RPMS and back down again. I think yesterday it actually stalled out on me. It has been pretty cold lately though, so I'm wondering if that has had anything to do with it. Mods are UTEC, HKS cams (264/272), BR turboback, drop in filter, forge recirculating BOV, and walbro fuel pump. Even before I had it tuned (with just the cams installed) the idle was way more stable than this-- just kind of lopey. I was hoping you all were having the same thing happen, and it's just kind of the nature of the beast. I will drive it again today and see if it's having any problems. Thanks.

 

I drove it some more and the idle stabilized after i drove it a bit. I guess it was just the cold.

 

Partly the cold, partly the ECU learning the new idle traits..

 

Good point. Hopefully it will not be a problem in the future. Otherwise I am very pleased with the car and the tuning.

 

Whoever tuned the car probably didn't set the base trims so they don't require as long to learn.. Its not a biggie, it may take a drive or two before the base trims adjust after the ECU is reset.

Hopefully its not a vacuum leak or something, but you can check that if it still continues.