In fairly cold weather (10-20F), the car starts and can be put into gear but the accelerator can't be depressed (seems to be stuck - but it's not).
Then, when the accelerator is FIRMLY depressed - or the car warms up - the transmission won't shift out of first.
When the car gets fully warmed up, everything's normal. It is temperature-sensitive, for sure. I drove it at 38F with no trouble, once it warmed a bit.
Thinking it might be low transmission fluid, I had it flushed and refilled. Still have the problem. Could be the shop didn't fill it per spec, of course, but I did check the dipstick before the engine was fully warmed up and it seemed like there was plenty of fluid in there. Too much?
The one other thing that's a tad weird - as it idled on a cold day, the car heater worked just fine. When I got it out on the road, though, cold air started to blow from the vents. Engine temp guage rises to normal and stays there.
Any thoughts?
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