Truck fuel problem

Asked by Guru9T21S 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
143,815

T_S_T answered 6 years ago

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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