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I have a 1989 suburban 5.7 liter throttle body. it lopes while idleing and when i try to take off in it it stalls and i have to feather the gas to go. i have replaced the fuel pump and filter, the iac valve, the tps sensor, the plugs and cap, vacum lines, and the coolant temp sensor on top of the intake. i have swapped out the map sensor with on off of i car i have with a 305 to see if that would make it improve but it is still doing the same thing. need help im out of ideas .
Have you tried replacing the fuel pressure regulator? I had the same issue with my 1994 C2500 3/4 truck.
Posted on Nov 18, 2009
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Posted on Jan 02, 2017
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