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Re: 88 GMC 1500 Backfire (Long)
Posted to Technical Discussion Forum on 7/26/2007

Hi Jeff,

The balancer hasn't spun I assume giving you false timing readings. Also, when he bolted all of the new parts on make sure he didn't leave off or break the O2 ground. (Tan wire) Are you sure the injectors are for a 5.7 and not a 4.3.

Good luck and... Login to read more.