For what it's worth, my '89 Chev heavy half, 4X4, Xcab, long box started idling rough and got horrible gas mileage.
Turned out the diaphragm had ruptured in the EGR valve, giving the same effect as pulling the vacuum hose off the valve and not plugging it. Plugging the vacuum hose made it run only marginally better. Wasn't until I replaced the EGR valve and got the system working properly that the pickup ran properly again.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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