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86 f-150 4.3 Backfires?
May someone here can tell me why my truck backfires when I let off
quickly on the gas pedal?I'm on my second muffler,it splits them wide
open.Around town it doesn't do it.It seem to only be when I'm going
around 55-60mph and let off the gas fast.I replaced the anti backfire
valve & the smog pump.It doesn't do it with the air pump belt off.Maybe
somebody can help me figure this out.Thanks! Bobby
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