2002 Blazer, setting this code only. Most Parts are new. It only sets the light once its warmed up. The Tach does not jump and engine runs fine. Thinking I need to shim it. Any suggestions on how to do it or any other recommendation to solve this problem. I can't get it to pass emissions with this light being set even with it running good

 

check this out - https://blazerforum.com/forum/showth...ght=PO335+Code

P.S............The search feature works wonders

 

Ok started working on it today. I shimmed out the CKP due to seeing some marks on it. It still runs fine. But now sets a P0300 code. Just about everything on this motor including the motor is new or been replaced. It has a quality aftermarket dist. in it. Plugs are E3's Not sure if this would be an issue. Any thoughts? I get no other codes other then P0300