Idling issue. MAP or IAC? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

osbornl1 · 07-01-2012, 03:33 PM

Trucks 89 v3500 454 tbi. 4 speed.

It starts fine and will sit and idle for 5-10 mins then stumble and die. It drives fine. Even crusing at 65-70 it runs fine. Now if I come to a stop sign or stop light I have to keep blipping the throttle or it dies.

Any ideas?

Oh and the previous owner messed with a screw on the front of the tb that's by the throttle. The more I screw it I'm the more open the butterfly's are etc. about where should these be set? Completely closed? Slightly opened?

Thanks
Larry
Posted via Mobile Device

07-01-2012, 03:33 PM	#1
osbornl1 Registered User Join Date: Mar 2011 Location: Cincinnati Ohio Posts: 55	Idling issue. MAP or IAC? Trucks 89 v3500 454 tbi. 4 speed. It starts fine and will sit and idle for 5-10 mins then stumble and die. It drives fine. Even crusing at 65-70 it runs fine. Now if I come to a stop sign or stop light I have to keep blipping the throttle or it dies. Any ideas? Oh and the previous owner messed with a screw on the front of the tb that's by the throttle. The more I screw it I'm the more open the butterfly's are etc. about where should these be set? Completely closed? Slightly opened? Thanks Larry Posted via Mobile Device



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