Question about 1990 Chevrolet S-10 Blazer

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Severe stumble on Accel. in 90' s10 blazer

When a load is applied to the engine, it sutters, sputters and tries to die. I have replaced the spark plugs, wires, distributor cap, and rotor button. I have ran a can of the fuel additive "seafoam" to no avail. It has a 4.3L six cylinder engine and is a throttle body, not a carburator. The transmission is an automatic.

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  • quikie420 Jan 09, 2009

    The problem was happening before the ignition tune up. I ended pulling the throttle body off and cleaning the injector. Also i changed the fuel and air filters. Unfortunately all at once and it fixed the problem, so i do not know which one to accredit for the fix. If i had to put a finger on which one was the fix, i would say that it was a combonation of the filters. They were both pretty nasty. Gotta love buying used.



    Thanks for the help everyone.

  • Steven Brock May 11, 2010

    did that trouble happen before or after ignition tune up?

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Sound to me like a map sensor or a throttle position sensor. It will save you a lot of time and aggravation to find a friend who has access to a scan tool. The only other way to know other than having someone with a scan tool do a diagnosis is to start switching parts. If you have access to a pull it yourself salvage yard, I'd ask them if you can pull a few parts and try them right there in their yard and if they don't change the way your truck is running ask them if they could just put the parts on the shelf and not charge you for them. most pull it yourself places are very easy to deal with and will try to accommodate you because the know you will be back and you will be telling your friends .

Hope this helps. Mike

Posted on Jan 07, 2009

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