lots of misfire

VOLVO S80
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LHE4SHO
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i've been gettin a lot of misfire i have a volvo s80 2.9 engine non turbo 1999... cylinder 1,2and 3 spark plugs were all full with combustion. i replaced them with new ones and also switch the coil pack to cylinder 4,5,and 6. within 30 min the same thing happened on the same side. so i know the coil packs are working. what can my problem be. the obII gives me the code of p0134, p0300 and p1174.
Nov 15, 2007 at 1:32 PM
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DAVEJOSEPH84
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I am having this same problem. I have good spark at all cyllenders, good fuel. What else could it be? Head gasket maybe?
Jul 17, 2012 at 7:10 PM
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HMAC300
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check fuelpressure and check for vacuum leaks
Jul 17, 2012 at 7:17 PM
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