Question about GMC Suburban

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I have a 1999 gmc Suburban that shudders on take off and up hills. I have replaced the intake and distributor, any ideas?

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Have the transmission checked.Could be a bad torque converter clutch.

Posted on Jul 22, 2009

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Look at the drive shaft and remove any debris such as mud. the drive shaft should be cleah in order to be ballanced. another thought is to check all tires for balance and lugs that are tight

Posted on Jul 25, 2009

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1 Answer

I just fix my intake gasket on my 99 gmc


when you replaced the intake gaskets you over tightened the bolts and cracked the plastic on the new gaskets or cracked them replacing the intake on the engine or the bolts needed to be replaced cause they were stretched or the wrong gaskets where sold to you and you have a vacuum leak these are the most common causes of the problem you are explaining the newer intake gaskets are very sensitive to over tightening you really have to be carefull and follow the tightening sequence and torque specs

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1 Answer

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It sounds like the choke is the most likely culprit. Take the air cleaner off the throttle body/Carburater. Have someone cover most of the throttle body/Carburater intake, if you don't have help use a piece of heavy cardboard. If it starts up right away it's the choke. Note: if you use cardboard don't rev the engine you may **** the cardboard into the engine.
I'm afraid with all the different types of choke controls I can't tell you how to fix your choke with out actually seeing it.

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Hi, the manifold absolute pressure (M.A.P) sensor is located on the intake manifold. I am not familiar with the GMC vehicles as I am in South Africa. The M.A.P sensor is usually situated on the top of the intake manifold furthest from the air intake/ throttle body. I hope this info will help.

Nov 24, 2009 | 1999 GMC Suburban

1 Answer

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I was factory trained to work on these cars, the problems i found for this symptom where this, a cracked air intake rubber flex hose, crack is on bottom and opens up when u accelerate, next is a defective MAF, which is a Mass Airflow sensor, neither of these two problems will set a code.

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BEFORE YOU REMOVE DISTRIBUTOR,MARK THE POSITION OF #1 DISTRIBUTOR CAP TOWER TO DISTRIBUTOR..REMOVE CAP AND TURN ENGINE TO LINE UP ROTOR BUTTON WITH THIS MARK..MARK DISTRIBUTOR HOUSING IN RELATION TO HOLD DOWN CLAMP OR BOLT..YOU CAN USE A PAINT PEN OR EVEN SOME WHITE OUT..YOUR TIMING SHOULD BE CLOSE TO WHRE TO WHERE IT WAS..I HOPE THIS HELPS

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