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Probably got a bad head gasket . Those motors are garbage.

While this could be the source of the problem and they are not known as the best engines in the world, there could be several other issues causing this to happen. My 93 grand am did the same thing. Replace the following:

Coil Packs,

Plugs,

Boots,

Ignition Coil Housing - This is most likely the issue.These housings are notorious for going bad and shorting out. It is a $40.00 part that can fix the problem and is easy to do yourself.

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โˆ™ 2007-10-03 20:34:12
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Q: What would cause a GM Quad 4 motor to backfire and be low on power?
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