I just installed the 4# lower and chip from REM on my 2000 Lightning. The question I have is the truck pulls strong to 3,500 RPM then it feels like the engine is stuttering and then pulls smooth. The autometer gauge is reading 14 PSI. I double checked and everything is installed correctly. Any help? Thanks in advance.

 

Are you hearing any detonation at all? And do you have good gas?

-dennis