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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  • 1 POST
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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LLOYDERBAUM08
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  • 26 POSTS
try checking the gap on th plugs, also try to replace coil pack and possibly timing could of jumpedhas it ever back fired? the eaist thing to do first is check plugs
Jul 15, 2008 at 10:39 PM