my question is on my 1981 ford fairmont. i had carb rebuilt, cleaned the fuel tank.adjusted the carb. it
has a slight misfire at idle, but does not misfire while driving like bucking or jerking. but, when it gets warm, about 45mins
of driving, the car stalls out when stopping, and the idle is real rough, have to keep foot on gas and brake to keep running.
i didn't change the spark plugs yet. do yo think by driving with old gas in the tank, it caused the sparkplugs to foul or get damaged? car was pinging like crazy, top speed was 50mph. so should i use factory copper plugs or platinum plugs?