My 2011 Silverado 4.8 V8 liked to rev up a few hundred rpms when I would inch it along or be moving in and out of N like when trying to get lined up on a trailer. Problem was dirt had accumulated around the air intake butterfly that the computer controls in determining engine speed for a given set of circumstances. Seems small dust particles....apparently getting through the air filter, and EGR engine oil vapor for a "binder" accumulating on the sealing surface of the butterfly made the engine run lean so the computer adjusted the fuel flow to keep it at 12% or whatever the design number.
Cleaning around the baffle and where it seals against the air plenum stopped the problem.....alcohol on a long, wooden stem, Q-tip type cotton swab and my finger....to hold the baffle open did the trick.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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