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Had the same problem. Took forever to find reason and fix. It turned out to be the plunger in the air/fuel sensor unit. Where the air filter is located. The service mechanic that I really trust and didn't take to initially, found it within three hours. No one else could fix it. Take the cover off. Clean with carburetor cleaner extensively. the plunger is stuck. Look at a service manual like Bentley's. I will come back on Monday and give you a more detailed description. sorry, I'm at work and can't remember everything.
I replaced and adjusted everything and still could not fix it. Even the idle control valve. It turned out to be something that a simple spray with carburetor cleaner took care of.
Have fun.
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