The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1990 TBI acts like it's loading up like a carb

Evkev7 · 03-18-2018, 01:41 AM

K so my 90 Suburban has an on and off again issue of sort of stalling out just off idle, and sometimes at speed in town.
It's a 4 bolt main 5.7. Stock. I recently bought it back from a friend who put the engine in while he had it. It was running way bad when I got it back, acting like the fuel filter was plugged. I went thru a few filters then replaced all the sensors on the tbi from stuff from the junkyard, air idle sensor, EGR, throttle position. Seemed to totally seemed to fix it.
It's 99% better. But the off idle stumble is annoying.
It is on 35 inch tires with somewhat tall gears. If I drive in 2nd gear in town it doesn't do the load up thing. Keeping the rpms up keeps it happier.
Thoughts from the experts would be greatly appreciated.

03-18-2018, 01:41 AM	#1
Evkev7 Registered User Join Date: Mar 2018 Location: Spokane Posts: 6	1990 TBI acts like it's loading up like a carb K so my 90 Suburban has an on and off again issue of sort of stalling out just off idle, and sometimes at speed in town. It's a 4 bolt main 5.7. Stock. I recently bought it back from a friend who put the engine in while he had it. It was running way bad when I got it back, acting like the fuel filter was plugged. I went thru a few filters then replaced all the sensors on the tbi from stuff from the junkyard, air idle sensor, EGR, throttle position. Seemed to totally seemed to fix it. It's 99% better. But the off idle stumble is annoying. It is on 35 inch tires with somewhat tall gears. If I drive in 2nd gear in town it doesn't do the load up thing. Keeping the rpms up keeps it happier. Thoughts from the experts would be greatly appreciated.