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Re: dump truck runs terrible backfires out the exhPosted by Bob DeVol on December 30, 2007 at 05:12:08 from (64.136.173.16): In Reply to: dump truck runs terrible backfires out the exhaust posted by Steven Keppner on December 20, 2007 at 22:27:16:
Hookup a vaccum gage to intake manifold and check -should be above 17 inches if not it may be late ign timeing- valve timeing (bad chain or jumped tooth)- vac leak.
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