89 c1500 305 v8

Asked by Apr 19, 2017 at 08:03 PM about the 1989 GMC Sierra 1500 C1500 Standard Cab LB

Question type: General

89 Gmc c1500 305 v8 Tbi .new fule pump.fule
filter.air controle.map sensor.throtle sensor.Egr.
plugs and wires still rums like crap first start high
rpm then levels off then startscto surge bad then
dies .any one know what is left to change lol

1 Answer


Should check for vacuum leaks. Snug up the intake manifold bolts, and take the TBI off and check the base gasket. There is the fuel regulator in the TBI that I'm sure is getting weak. Just check the fuel pressure, it should be 9 to 13 lbs. You can get a rebuild kit or a new regulator for this yet.

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