"My car hates me" saga continues--more trans issues

[alone_and_insane]

So on my way back to WI from Dearborn yesterday, I got caught in 2 hours of stop-and-go traffic. After I finally got out of it, my car decided it no longer wanted to downshift on moderate tip-in. For the rest of the ride, it took a LOT more throttle input to actually trigger a downshift than it did before. It also usually used to downshift when I was accelerating with cruise control, but after I got through Chicago it didn't do that anymore. This transmission just got rebuilt last summer. Any idea what the heck is going on?

[1BADAIR]

not downshifting or just not unlocking the TCC?
trans tune in pcm changes for temp. trans runs the coolest while locked up so maybe it was staying locked to try and cool itself?

[alone_and_insane]

yeah I thought of temperature too, but idk how all that stuff works. I haven't driven it since I got home yesterday, so idk if the problem is still occuring now that it's cool. it still happened for the final 3+ hours of the drive after Chicago.

[ICEPICK]

may have to go out and test it to see whats up, maybe burnd it up.

[alone_and_insane]

drove it a bit today, no difference I'll check the ATF tomorrow, see how that's looking.

[alone_and_insane]

so I took the car to the shop that did the rebuild. No fluid issues, no codes. The guy said he "couldn't replicate the problem," which is BS because if he had driven the car before and after it started acting up, it would be a night and day difference. Also, idk if I mentioned this before, but sometimes in stop-and-go traffic when I actually start building some speed, the car sort of "hiccups," like it decides to downshift and suddenly says "just kidding." Something the trans guy said is it may be the throttle position sensor. Does that sound feasible?

[steddy]

You could grab an anolog (needle will provide swing, rather than a digital jump) multimeter, remove the current TPS and check how the arm acts as you turn the tab that activates the TPS to see if there are any jumps, lags, or spikes in it.