My 1990 Gmc Sierra is possessed

gmc
2500

#1

my truck after it warms up completely cuts out at low speeds like when idling through a parking lot. The lights flicker and the truck will die it cranks right back up but will continue to do this. I have tried The IACV on the tbi, spark plugs and wires, fuel filter please help


#2

Have you tried looking for vacuum leaks?


#3

yes and no vacuum leaks were found My mechanic is even stumped.