Originally Posted by
cobaltssoverbooster
Seals are tolerance fit, this should have happened. I was waiting for someone to bring it up, thanks.
Knock sensors don't really do much as far as position, if it's solidly bolted to the block material at torque spec the signal will be the same. Your exhaust is a big issue since the rattling will set the already super sensitive knock sensors off.
As for lean idles, the evap sensor likes to leak and I would recheck all the manifold gaskets and clamps that are under pressure.
Also verify your map sensor data matches the two boost sensors that are installed. This causes data capping. Also if your reading boost on a interceptor the can signal maxes out at alike 257 kpa so it's fairly inaccurate. Plus you can't log your boost pressure along side other data if you only use the interceptor.