Hello
Pontiac Bonneville 97
3800 II NA
130k miles
Symptoms:
1) Idles poor, always
2) Somewhat consistent multiple misfiring issue, cruising speeds. Occassionally at idle or on freeway.
3) Once it's warm, Knock Retard from .5 to 9 degrees, irregardless of speed. EXCEPT, not under WOT
Replaced Fuel Filter/Sender/Pump, Switched injectors, new plugs/wires/coils, MAP, TPS, cleaned w/GM engine cleaner thru intake, ran oil cleaner, fuel cleaner
NO CODES
LT Fuel Trim Mostly Rich, ST Tends to be Rich
Any thoughts??