-- 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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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