I have a pontiac grand am gt 1999... i have changed the TPS, IAC sensor, purge valve, fuel filter, spark plugs and wires.. and theres still a misfire, it turns on but when i come to a stop it turns

30

Asked by Apr 08, 2014 at 01:35 AM about the 1999 Pontiac Grand Am 4 Dr GT1 Sedan

Question type: Maintenance & Repair

I dont know what else it could be. I need
help, i also cleaned the throttle body. And
air filter is new

2 Answers

275,535

Is the CEL on? If it is indeed a misfire, those are caused by the ignition system. Coil, spark plugs, wires

30

The check engine light is on. I was told theres a misfire in spark plug #1 could this be the coil since the spark plugs are new

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