Hello, this is my first post. I have a 2003 trailblazer ltz 4.2 and the problem im having is almost a dieseling effect when i turn it off. It does this shake shudder thing for 2-3 seconds about 90% of the time and on rare occasions shuts down normally (instant stop). Im also having lack of power issues and low rpms then really kicks in at higher rpm.... and when i use the power windows at idle it almost stalls and idles low for a second. Not sure if this is all related or not.
Ive replaced the cat. converter, spark plugs, fuel filter, vvt solenoid, and thoroughly cleaned throttle body off the vehicle. Checked for loose intake bolts, and checked coils. No check engine light. Any help would be greatly appreciated. Thanks
Ive replaced the cat. converter, spark plugs, fuel filter, vvt solenoid, and thoroughly cleaned throttle body off the vehicle. Checked for loose intake bolts, and checked coils. No check engine light. Any help would be greatly appreciated. Thanks