-- 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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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