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It could be timing or a bad distributor cap. There are other possibilities as well but those are the two best candidates. Check the Spark plug wires. I had the same problem and it was due to corroded rubber insulation on my wires. resulting in electricity arcing over to the engine! this was not good, but a change of the wires was all it took to fix it!

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Q: Why might a 1990 VW Jetta be backfiring and hesitating when you try to accelerate?
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