2000 Chevy Prizm 2000 prizm misfire

2000 CHEVROLET PRIZM
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ERICW1
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Engine Performance problem
2000 Chevy Prizm 4 cyl Front Wheel Drive Automatic

got a number 4 cyl misfire code,replaced plugs,swap coil with 3 and problem followed coil.replaced coil,problem still there,what look for next?it has very rough idle(if it idles)doggy,number 4 plug gas fouled.smokes when starts,any help be great
Dec 9, 2009 at 8:28 AM
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MMPRINCE4000
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Start by performing a compression test on all cylinders. Engines need spark, fuel and compression to fire. If compression is low, could be a stuck valve or possible headgasket.
Jan 17, 2010 at 8:03 AM