Q: Q: My Check Engine Light is on and my engine misfires

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  • Had the warning light checked. comes up misfire cylinder #2.
  • Runs fine when it's cold. runs the worst when it's warmed up.
  • Chevron gas treatment makes the problem go away.
  • it been like this for YEARS

my guesses - plugs - coil pack - fuel injector

My car has 180000 miles.
My car has an automatic transmission.

Hello there. Many common faults could cause your vehicle to have a cylinder #2 misfire. The most common faults are the spark plugs, spark plug wires, coil, fuel injector, a vacuum leak, or low compression in the #2 cylinder. Given that the gas treatment temporarily fixes the issue, it is likely that the fault is on the fuel system side. A qualified technician, such as one from YourMechanic, will be able to diagnose your engine misfire and make any repairs required to get your vehicle running normally again.

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