My Yukon has 187,000 miles on it (I know, kinda scary), and I'm mechanically inclined, however, this is baffling. I will begin by saying this happens at random (once every 10 days or so?), and I don't get a check engine light. Doesn't matter what the weather is like either. It's as if the TPS is bad, where once I accelerate, it upshifts waay too early and bogs the engine down, like it doesn't know what gear it's supposed to be in. Also when I come to a complete stop, once in a while it won't downshift into first gear. Even when I floor it, it refuses to downshift. I have replaced the TPS with a brand new one, and it didn't work. I then manually downshifted through the gears when stopping and manually upshifting when I take off when the truck was acting up. That seems to work. Also, when this happens, a simple 10 minute drive, shutting the truck down, then restarting and everything works again. Any and all suggestions are welcomed. Thanks for taking the time to read this.
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