The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Falling on face/missing/backfiring (through intake)?

**BigBird05** · 05-25-2020, 09:37 PM

Do you have a hand vac pump. Hook it up and look at the vac advance to see if it moves and holds or does it leak down.

05-25-2020, 09:37 PM	#29
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: Falling on face/missing/backfiring (through intake)? Do you have a hand vac pump. Hook it up and look at the vac advance to see if it moves and holds or does it leak down.