Everybody has given good suggestions so far. The easy one is pull the idle air control off the throttle body and fill it with carb cleaner. If there is any varnish/sludge haning up the plunger, the carb cleaner will eat it. Cleaning the throttle body is another good one. If you have a digital ohmmeter, you can test the throttle position sensor. Slowly sweep the throttle and watch the meter. It should always move up or down depending on which wires you're hooked to with no open circuits or huge changes in readings. If all else fails, then I'd try replacing the EGR valve.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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