Being a tech at a GM dealer I can say what you describe is likely a leaking EGR valve, vacuum leak, dirty injectors, not necessarily in that order. When looking for vacuum leaks don't overlook the brake booster as a potential source of un metered air. The EGR valve is a round thing about the size of a pop can with a wire connector on top and metal tubes going into the bottom, one from the rear exhaust manifold the other going to the intake on a 3.8. On all others, it will be an internal passage on the corner of the intake. It is fairly close to the brake booster.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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