Annoying and unreliable.Cant figure this 1 out.So heres a list of new parts replaced to try and resolve this.CKP,FP,MAF,CMP,TB and WP just cause I was in there.This is not a misfire.PC cuts fuel to ALL cyl at once.Verified with noid lights.I have 2 codes that are irrelevantO 340 & PO 401.Engine runs great and has power otherwise.This problem happens any time the engine is running.



Thanks Bigblock

 

Also changed the ignitor and checked the plugs.

 

Sounds like a wire(s) from the ECU to injectors is shorting out. Also, are all your grounds in the engine bay in good shape and attached?

 

Actually someone added extra ground wires.Along with the factory ones.

 

Its getting worse.Wont idle anymore.Heres a list of whats been done today.Plugs,wires,coil boots,O2 sensor(front),CTS,TPS,cleaned throttle body.Really all thats left is the ECM and wiring harness.I'm not sure a dealer could find this problem.Any thoughts?

 

I finally found the problem.For those of you who were curious about this the cam position sensor wires were crossed.I guess the last village idiot had to replace the connector.