First thing you want to do there is to clean up the throttle body bore using carb cleaner, especially around the perimeter of the throttle plate on top and bottom. Next will be to spray some into the opening near the top that goes to the idle control valve (you can feel air rushing into that port with your finger with the engine running). Often that will clear anything that's keeping the idle from returning to normal. Also check to make sure the throttle cable is in good condition and not binding and that the return spring is in place. If that fails, remove the idle air control valve and manually clean it. Do not loose the "o" ring or turn the valve extension when doing that though.
You also need to check all the vacuum hoses connected to the engine to make sure none are split or disconnected. Check at the engine end and then trace each to it's destination, inspecting each part as you go. Most times doing that will find any vacuum leaks you may have. You can also spray cleaner along the parting line between the intake manifold and cylinder head. If the idle changes when diong that, you have a bad gasket there or a warped manifold. Sometimes slightly tightening the bolts will help, other times you need to remove the manifold.
If you have a check engine light on, have the codes read. That is also helpful in finding any control problems. Most larger parts stores will do that free.
Check engine light on yet? I'd still check the vacuum hoses for leaks. If one was cracked, it may have gotten worse. I'd also check the throttle position sensor as well. Get yourself a chilton or haynes manual and a digital multi meter and even if it stops running altogether you will be able to do individual component tests.
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Engine stall or RPM fluctuates
at idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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Hello, I have a new developement now it does not start unless I feather the gas to keep it running, if I don't it just dies. I will have to ask another qeustion and see if somebody can help with this new problem. I was hoping to get to try this solution I think that it would helped , but alais I can't keep it running to try this fix. I thank You very much for the help and if You know what this problem is I would gladly try it. thanks for any and all help.
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