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Start here: Check for cracks in the coils, to check, start the car and look at the coils to see if its jumping fire anyplace, If so this is the problem, If not, replace the plug wires. This advice is about 90% accurate. May not fix it though. You might also check for loose bolts on the intake manifold or broken (leaking) vacuum lines.

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Q: My 1997 buick lesabre car is backfiring what could be the problem?
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