2003 Chevrolet Malibu Just Changed Heads Injection Gaskets 3 Months Ago

2003 CHEVROLET MALIBU
122,000 MILES
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I have a problem just changed my heads and injection gaskets 3 months ago. now my check engine light is one. it was blinking now it stays on. but now its reading a p0302 code and i replaced my spark plug to that cylinder wires. but Im still getting a knock and misfire. what can be the problem?
Apr 8, 2013 at 4:10 AM
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ASEMASTER6371
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a knock????? please explain

start with compression test.

Roy
Apr 8, 2013 at 9:21 AM
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