Your idea of deleting the AFM is a good one. GM's vehicles no matter what year, have the potential to cost money for repairs. When changing vehicles, you do risk assuming someone else's lack of maintenance and the new vehicle's mechanical problems. The possibility of getting a bad head or two is...
It is not likely that a failing battery is causing your problem, but.....GM cars and trucks can be susceptible to having unexplainable electrical symptoms, which disappear after replacing the battery or the alternator. If an internal battery connection starts to fail or the alternator has diodes...
Some of the tire web sites, Goodyear for example explain how to reduce oversteer by lowering tire pressure. I did lower my pressure to 35 psi and the wandering was reduced some. A supplemental steering stabilizer will help as well.
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