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I change the engine on the car and it's bacfireing and hard to start with backfireing at all the time but it's runing it run fine

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This sounds like a crossed sparkplug wire, start by making sure the firing order is correct, if theres a sparkplug wire in the wrong spot this would cause hard starting and the backfiring, so check the firing order first, i would of given you a firing order diagram but you forgot to list the year, make , model and the engine size. good luck and have a good day.

Posted on Mar 18, 2011


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