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 - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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