Originally Posted by BillBoost37
Yikes..tougher problem going on here.
Ok.. First off...Let'* buy a new plug. Dropping a plug can cause any number of cracks and small things that may show up intermittantly. Secondly.. is the miss always on the same cylinder or two cylinders?
When swapping coils and ICM did you clean the mounting plate of any corrosion, check grounds in the engine bay? The problems you are describing could be power related and not necessarily an injector or plug.
One of the biggest culprits we find after normal maintenance is up to par is power fluctionation caused by corrosion etc. Check battery cables at both ends of all cables. While the cables are off the battery..pull the rubber boots off and look under for corrosion.
Bill.... new plugs, ALL are firing now... i jhave a rough idle (sounds like a single cyl miss) and when i free rev it up and down the RPM eventually it will backfire through the intake with a *pop* and then run funny make a whining sound (Supercharger) and struggle with minimal power.
Battery-new, terminals good.
ICM, replaced plate and checked the ground connection underneath... weird.
I can't figure why my Scantool shows 12.8 Volts and at the battery 13.8.... I am wondering if the ignition is cutting out.... or the BCS. Don't know too much about it, but my guage seems fine until the *pop* and then everything is bobbing around.