2006 Mazda 5 misfire #1

2006 MAZDA 5
120,000 MILES • 4 CYL • 2WD • MANUAL
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UPI
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My car started to run rough, took it to auto store and they hooked it up to scan for codes. They said misfire in #1. I have checked the plugs , the ignition coil and the fuel injector all good. What else could be the problem ? This one is driving me crazy, help will be greatly appreciated.
Sep 19, 2010 at 5:09 AM
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RASMATAZ
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P0301 Misfire at no.1 cyl-Check the compression for no.1 cylinder-you did the plug and injector on it and checked out-
Sep 19, 2010 at 5:14 AM
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UPI
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Thanks for the advice, just did a compression test all were 75 psi exept for the #1 zero psi. Checked the coolant and it looks clean, oil looks clean too.
Sep 19, 2010 at 11:30 AM