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 - A Tinker�s Guide to Manifold Repairs - by Curtis Von Fange. A common characteristic of keeping older equipment is that some parts to make repairs can be extremely difficult to locate. For example, finding a replacement for a cracked intake or exhaust manifold on a unique tractor or odd brand can be a frustrating and downright impossible mission. So, what is an alternative solution to scraping out that �one of a kind� piece of history? First, decide if you are one to try a repair yourself or have someone else do it. If you are uncomfortable about
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