-- No codes on the computer. -- Hooked up the vacuum guage to the brake vacuum line. 20psi at idle, 21-1/2psi at 2000rpm and holds steady.
If I'm reading the Haye's book right, that pressure should drop and/or I'd have to keep increasing throttle to maintain 2000rpm if the exhaust system was plugged.
Going off Alan's diagnosis, I'm still guessing I have a cat that is in the early stages of plugging up. $290 for an "exact fit" through RockAuto, I think I may live with it for a few weeks and see I can carry the vacuum gauge with me and catch the truck when it acts up next.
I suppose I could always order it and if I pull mine off and it looks clear return it.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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