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Don't worry about what the "voltage" gauge reads unless you are getting performace/driveability issues from it. If you are really getting less than 14v with the truck running, the tranny wont shift properly & you will get all kinds of strange electrical issues. It typically is a bad alternator. I'm not familiar with the 1997 3.2L, but I believe the EGR valve is @ the rear left corner of the engine. You'll see a feed tube tapped into one of the exhaust manifolds. Follow where that tube leads to- that will be the EGR valve. Your intake/ throttle plate area, EGR system, PCV & breather system need a good cleaning every 25Kmi. A couple cans of carb cleaner & a few minutes work is all it takes!
G/luck
Joel
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