my 4.3 tbi.it sputtering when im apply gas.if I gradually give it gas ok.if im kinda heavy on it its sluggish. if I floor sluggish, but then smoots out an ok.
I rebuilt my tbi.then rebuilt one out of the yard.then rebuilt one a friend gave me.nothing changed.plug an wires
check.cap check.fuel filter check.gas supply line check.a module on the front left side of the tbi.i dont know what it
is.but my buddy told me to swap it out check vacuum yup check.im beside my self.if the intake or gasket was
bad.wouldnt I get some kind of leakage???.can ya help me bro????
Sounds like a throttle position sensor issue.
http://easyautodiagnostics.com/gm_tps_test/pickup_van_tps_1.php -- here's how to test yours. Hope this helps.
It was the coil pack
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