Question about 1994 Chevrolet S-10 Blazer

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Rough idling sluggish acceleration

1994 S-10 4.3 vortec truck runs but idiles rough and kinda makes a chugging noise when trying to acclerate changed fuel pump,o2 sensor, plugs wires and distributor still the same. when running smell gas acts like it is getting to much fuel and when changing plugs noticed that leeft side plugs looked fine but right side plugs were very black and smelled like gas any help would be greatly appreciated

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  • tommysutton8 Jan 09, 2009

    thanks for the help havent had time to relly work on it yet but i will keep u posted on progress and what the solution was thanx

  • Anonymous Mar 23, 2014

    truck runs fine. the next morning it wont start without pumping gas pedal and it runs rough and has no power.

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These 4.3L W motors are common for fuel leaking inside the plenum causing them to run rough and smell like raw fuel. The fuel pressure regulator leaks internally, also the injector spider leaks and the two fuel lines feeding the fuel to the spider. You have to remove the plenum and look for the clean spot. Where the fuel leaks it cleans the oil off. Before you try this check your EGR valve. The EGR valves on these get stuck open with carbon and cause a rough idle. Remove it and look for the plunger it is a small round piece that you can push in and out, make sure it closes fully. You can also clean it with carb clean and they make a replacement gasket with a screen in it to keep chunks out of it. Start with the EGR because it is easier. The parts for under the plenum are available at most any parts store. If you have any problems just ask, and if you can not find the parts I will give you part numbers. Let me know what you find I will be back tomorrow.

Posted on Jan 07, 2009

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