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Blown head gaskets are one of the most frequent causes of misfiring in adjoining cylinders....do a compression check; check for oil in your coolant and/or coolant in your oil.

But, it could be a number of other things as well.

(Not necessarily in declining order of likelihood..... )

1. Burnt Valves (as above, do a compression check)

2. Old, worn out, shorting out distributor wiring harness (replace it anyway if it's old)

3. Starving for fuel (check fuel pump/filter)

See your friendly, local mechanic!

Good luck.

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Q: What wold cause a misfires in 1999 Chevy on the 4 rear cylinders?
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