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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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