"misfire" codes keep coming back and engine will run rough.

1999 KIA SPORTAGE
95,000 MILES
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DBATCH
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replaced spark plugs, both coil packs, and o2 sensors. upon start up, car will run fine for a few seconds, then start to run rough. scan and will get either #2 or #4 cyl. misfire code.
Jun 7, 2012 at 12:30 AM
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SATURNTECH9
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Have you checked compression yet?
Jun 7, 2012 at 1:14 AM
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DBATCH
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checked compression, average is about 105 on each cyl. but i dont know what would be a good compression.
Jun 10, 2012 at 1:13 PM
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SATURNTECH9
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You have the 2.0L engine?If so it says compression is 188psi so that would be pretty low compression.
Jun 11, 2012 at 7:16 PM
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DBATCH
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should i find a used head or have this one redone, problem is kind of short on cash. i had to replace the exhaust manifold, it was cracked in two spots about 3" long.
Jun 11, 2012 at 9:36 PM
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SATURNTECH9
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Since the compression is low across all the cylinders i would check the cam timing.
Jun 12, 2012 at 1:05 AM