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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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