I have a 2009 PT cruiser with a p302 code that comes on only at idle speed. It also has poor/slow acceleration, especially up a hill. When i accelerate the car, it gets high RPMs relative to its speed. It may hit over 4000 RPMs before i reached 25-30 mph. I have to continually take my foot on and off the gas in order to accelerate. When I am at a stop light, the car idles roughly. Also, I changed all of the spark plugs, fuel injectors, spark plug wires, intake manifold gaskets and coils relative to cylinder 2.
My car has 137000 miles.
My car has an automatic transmission.
The misfire is most likely from a vacuum leak either in the PCV hose or valve or the intake manifold itself has a leak in the housing. Replace the PCV valve and check PCV hose and then if problem continues then you should check the intake manifold for cracks and vacuum leaks.
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