1972 GMC 400 BB stalling at stop light - The 1947 - Present Chevrolet & GMC Truck Message Board Network

10BamBam01 · 05-30-2015, 09:59 AM

Truck runs fine at first few miles. Then the idle will drop too low at a stop light and it will die. I have adjusted timing and set the idle speed higher so that when it goes in gear it will still run. Idle is set to 900 or so in Park and then in Drive it's at 650. When the engine warms up is when the problem starts. It will periodically "sputter" or gasp when going down the street, especially when I just touch the accelerator.

I recently put new HEI dist, new plug wires, checked for vac leaks, checked vac pressure and timing. Can't figure this out. Any ideas?

05-30-2015, 09:59 AM	#1
10BamBam01 Registered User Join Date: Jul 2013 Location: Cedar Rapids, IA Posts: 22	1972 GMC 400 BB stalling at stop light Truck runs fine at first few miles. Then the idle will drop too low at a stop light and it will die. I have adjusted timing and set the idle speed higher so that when it goes in gear it will still run. Idle is set to 900 or so in Park and then in Drive it's at 650. When the engine warms up is when the problem starts. It will periodically "sputter" or gasp when going down the street, especially when I just touch the accelerator. I recently put new HEI dist, new plug wires, checked for vac leaks, checked vac pressure and timing. Can't figure this out. Any ideas?



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