(po306 only)rough idle after warmed up,good accelaration & off idle preformance on 1996 Ford Aerostar

new plugs,wire's,coil pack,02 sensor,isc motor.good compression vacuum steady at 18 motor has valve train noise after warmed up changed rocker arms & push rods on #4,#5,#6 head motor runs & sounds 50% better code po306 came back after one day.the motor dose not over heat no back firing motor will spin the tires.Question will the code po306 set if cylinder #2 is miss firing since coil pack fires both cylinder #2 & #6 at the same time

by in Flagstaff, AZ on June 02, 2013
2 answers
ANSWER by on June 03, 2013
IF it runs rough only at idle and compression is good on all cylinders, recheck for a vacuum leak, may need to smoke test the vac. circuit to find. (2 has nothing to do with 6)
ANSWER by on June 03, 2013
misfire #6 cyl have it diag as to save time and money

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