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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
... [Read Article]
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