2000 GMC Jimmy 2000 GMC Jmmy all of the cylinders have zero

2000 GMC JIMMY
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EDDIEMIZAEL
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Engine Mechanical problem
2000 GMC Jimmy 6 cyl Two Wheel Drive Automatic

I change the head gasket on my jimmy and when i tryed to start it all the cylinders had zero compression and also has a backfire....do you think its the timing is right
Mar 30, 2010 at 1:28 PM
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