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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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