That engine uses the MAP sensor reading before startup to determine BARO value. If memory serves, the EGR valve is not computer controlled. It uses ported vacuum from the base of the TBI unit. Check for leaking or plugged vacuum line to the EGR valve AND to the MAP sensor. While you're at it, check for vacuum leaks at all the vacuum fittings. The electrical connector at the MAP sensor often gets the retainer tab broken off, so check to be sure it's not loose. A "chicken band" plastic tie is a common fix for that problem. Also, you might want to remove the EGR valve and check for a plugged passage in the intake manifold. HTH Good Luck and God Bless
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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