Having problems with your 1989 Chevrolet C2500 ?

High idle 89 c2500..5.7 TBI... starts normal idles fine, then sputters a bit and kicks into a high idle and wont stop.. i recently replaced the following-- Fuel pump,fuel filter, TPS, coolant temp sensor,ignition control module, idle air control valve, ignition coil, cap, rotor, wires, plugs, starter, fuel injectors...sometimes it wont idle high and i can drive it for an hour or so with no problem..then out of no where it'll start idling high.. im confused ..if anyone has any suggestions ple

Posted / edited by AnonymousUser on : 16-07-2018

Answers :

It's probably one of two things , a vacum leak or a bad ground.
Repair Help & Product Troubleshooting for 1989 Chevrolet C2500

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