1997 Pontiac Sunfire code po121 po304

1997 PONTIAC SUNFIRE
137,000 MILES • 4 CYL • FWD • AUTOMATIC
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JOHN SCHUTTENHELM
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the code shows PO121 tps/pedal position sensor A replaced both PO121 still comes up also po304 cyl.4 misfire.runs rough stalls. plugs are good.tried a good plug wire ,no difference.coil pack?
Jul 15, 2008 at 3:25 PM
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