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1989 chevy c1500 EGR solenoid vacuum loss to EGR ,while increasing rpm vacuum rises to 10-15 suddeny drops?
good vacuum to solenoid,with a vacuum gage hooked to the hose at the egr at idle no vacuum coming from solenoid,as rpm is increased vacuum jumps to 10-15 lbs then immediatelty drops to 0 untill the engine
is returned to idle and reved up only to repeat the vacuum drop.
soleniod or ecm?
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