Question about 1990 GMC Sierra

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90 GMC 350-THROTTLE BODY CARB..RUN WHEN IDLE..SOON AS YOU APPLY THE THROTTLE IT STALLS OUT

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 2000 gmc rough idle

Im not sure if this can help, but my 2000 gmc sierra was idling badly. Replaced Fuel Pressure Regulator and my truck runs like its brand new. My service engine light was also on.

Posted on Jan 10, 2009

  • 255 Answers

SOURCE: no spark but turns over replaced ignition module,coil,ecm

could be in the crank position sensor

just a thought shack

Posted on Apr 18, 2009

csmock132
  • 4669 Answers

SOURCE: 1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed.

Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

Posted on Jun 02, 2009

co7196
  • 3433 Answers

SOURCE: my 1993 GMC Suburban 5.7 liter with throttle body

Wow, That has gotta be a pain. The Maf sensor regulates the fuel supply needed for proper air fuel ratio by telling ecu how muc air is moving thriugh the intake. Check it first, Then the TPS. Good Luck.

Posted on Jun 05, 2009

  • 14 Answers

SOURCE: high idle CHevy 350 TBI

check if went from a V6 TO V8 need power two more cylinders

Posted on Jun 21, 2009

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1 Answer

Gmc engine stalls when i stop abruptly


First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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I have a 95 1500 with the 350, sometimes it starts and runs great, other times right after it starts it will shoot up to 2000 rpm, the service engin soon light comes on and if you drive it, everytime you...


Try removing and cleaning the idle control solenoid on the throttle body. They get contaminated with carbon build-up and gives you an erratic idle. It's the round solenoid that screws into the side of the throttle body. When you remove it you'll see a spring loaded plunger that needs cleaning with throttle body cleaner and you'll need to clean the seat inside the throttle body as well.12_24_2012_2_14_19_pm.png

Dec 24, 2012 | 1995 GMC Sierra

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I have a 90 GMC Sierra, 5.7 ltr, 2 wheel drive, 1/2 ton. I recently replaced the ESC module ,MAP sensor, and TPS, because they coded out... I also replaced the distibutor as well. I was running well this...


Try spraying a couple shots of carb spray down the throttle body while a helper cranks it over. If it starts and runs for a couple of seconds check fuel pressure and the resistance of the injectors.

Nov 29, 2012 | 1990 GMC Sierra

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1992 suburban stalls


spray carb cleaner around the base of the throttle body when cold see if the idle changes if you also have surging then replace the pick up coil inside the dist

Aug 17, 2012 | 1992 GMC Suburban

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2000 gmc sierra battery died and i put new battery in but now the truck will not idle. It runs but as soon as i take foot of gas it stalls. What do I need to do?


clean the throttle body and idle air control valve start it and hold your foot on the gas and release the pedal the idle needs to relearn its position

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2003 stalls when coming to a stop


try cleaning the throttle body with a good carb cleaner and tooth brush drive the car to relearn the idle if that don't work then try a pcm reflash

Jan 25, 2012 | 2003 GMC Envoy

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I replaced my battery in my 2004 GMC Envoy last week now the car cuts off/stalls whenever I come to a complete stop. It fires right back up once I put it back in park and start it again.


The throttle body needs to be cleaned, When you disconnected the battery, the computer reset to factory defaults and now with a dirty throttle body, it will run poorly at idle. Make sure both the front side and rear side of the throttle body are cleaned thoroughly.

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Oct 08, 2009 | 2003 GMC Yukon XL

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Soon as i let off the eccelerator it stalls wont stay running unless foot on the gas


Pull AIS (automatic idle speed) or IAC (idle air control) motor off, clean with carb cleaner or throttle body spray cleaner, as well as port it came out of & see if that doesn't help or cure it. If it cures it for a while, then starts to do it again, replace it. (located on side, at front part of throttle body usually.)

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