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Re: 454 engine backfiring by Mark L
1993 Motorhome with 454 injected
The engine backfires a bit when it is cold then runs fine for long enough for you to get on the freeway and out of town to that first long grade.... at that point it starts to backfire up the hill. when the road levels out so will the engine. I have read the earlier postings and no one seems to come back a tell us/me what really worked...
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