Question about 2001 Chrysler PT Cruiser

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REF: Code P0303

My vehicle has registered code P0303. It idles rough and occasionally misses while driving. What are some things I could check? My pt cruiser 2001 will shake for a bit when in idle. I just had the spark plugs and wires replaced,after the mechanic diagnosed it with a P0303,misfire in the 3rd cylinder, and it ran well for a week.
Now it is misfiring again, imparticularly when I start the car and it is in idle ..it'lll shke a bit then eventually stop and run fine.

Any ideas?

Thanks,
poppy

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  • David Melrose May 11, 2010

    It might have run fine for a week because it had a new nonfouled spark plug in the bad cylinder. Once the plug fouled, it started missing again. I would check the spark plug for that cylinder and see if it is fouled again. If it is, then check the injector for that cylinder as well and see if it is leaking. A leaky injector will run rich at idle and cause the cylinder to occasionally miss.

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This will help.

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