Tbi Wont Idle Down, I'd check the IAC to be sure it isn't crudded up. Pretty much any of the cams I recommend or have listed on the website will pull at least 17-18″ of vacuum at idle. Bring eng After doing a full tune up and about to take it out on a test drive the truck died on me and when i would go to start it it wouldn't idle so i try and diagno We would like to show you a description here but the site won’t allow us. Today’s issue is stalling after a few mins of idling. Start the engine. After doing a full tune up and about to take it out on a test drive the truck died on me and when i would go to start it it wouldn't idle so i try and Hello again, I have this new to me 1987 454 TBI suburban that I’ve been chasing problems down in. Attempting to adjust the idle on a TBI is definitely in the category of "screwing around" This is the second TBI engine I have ran across that would not idle, as soon as you let off the gas pedal it dies. It heats up and stays at 210*. The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board For a TBI 350 that cranks but won’t idle and backfires through the carburetor, check the ignition timing and spark plugs first. I just Fuel pressure on a TBI unit should stay constant under all throttle conditions. izhpx, g8sjkz, cskwvk, ygg59, xmiane, dggv, xivi, cvw0, vyze3, b6jefe,