why is my 1990 f-150 backfireing threw the plentum
my truck is backfireing threw the plentum I have checked the fuel pressure and it idles at 38 psi and drops to 32 psi on rev is that proper pressure if so what ealse could be causeing the problem
misfire is there any check engine lights
no check engine lights
351 and over 100,000 I have changed timeing gear and chain in past
possibly a valve. run a compression test if the backfire is consistent and steady
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