The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Help, High idle problem TBI, how the heck do you get it down.

68gmsee · 02-10-2018, 04:10 PM

If it's running fine with it unplugged there's bound to be a leak somewhere. Is it possible that a vacuum line from the tank may have broken or come unplugged? http://repairguide.autozone.com/znet...528005c9bd.gif

It could also be the intake manifold gasket or other place where air may be getting in. The problem with running with it disconnected is that when starting or when engine is cold it may have trouble idling properly -sometimes when coming to a stop.

There is a possibility that the IAC is new defective. These days even OEM parts are not super reliable. I can't begin to count the new parts I've returned in the past for being defective.

02-10-2018, 04:10 PM	#20
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Help, High idle problem TBI, how the heck do you get it down. If it's running fine with it unplugged there's bound to be a leak somewhere. Is it possible that a vacuum line from the tank may have broken or come unplugged? http://repairguide.autozone.com/znet...528005c9bd.gif It could also be the intake manifold gasket or other place where air may be getting in. The problem with running with it disconnected is that when starting or when engine is cold it may have trouble idling properly -sometimes when coming to a stop. There is a possibility that the IAC is new defective. These days even OEM parts are not super reliable. I can't begin to count the new parts I've returned in the past for being defective. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...