Ok so here is my problem. I have a Lsv turbo w/ chipped p28 running s300. Cold starts I will not have a misfire and can beat on the car all I want. It won't misfire. After shutting the car off and letting it sit for a few minutes if you start it idles horribly suggesting a misfire. Not IAC or fitv. The cell will come on. When trying to retrieve codes the cel Stays solid... no codes.
I've replaced plugs
Resistance in plug wires are good
Injectors all read 2.5 ohms
compression test was good
Any ideas or input would be awesome. Thanks

 

had similar problem with my s300. I had to connect a laptop to the ecu to actually see the cel.