Truck fuel problem

Asked by Jun 16, 2017 at 11:49 PM about the 1999 GMC Sierra 1500 SLT 4WD Extended Cab LB

Question type: General

Replaced fuel pump cut cats put straight
pipe plugs wires distributior cap roter now it
cranks but idle is reving up and down up and
down please help

2 Answers

Could it be fuel pressure regulator

72,015

Dont think it,s regulator,being cats are off it may be causing the ecm to not know the fuel air mixture and has to purge fuel/meaning dump at idle,try unhooking the throttle position sensor and running it.

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