So I picked up a '92 with the 4 speed auto with 250k on it. I've had it for a few months as my daily driver. Runs strong no real issues thus far. UNTIL the other day I noticed it started not wanting to shift up on acceleration. Primarily out of 2nd into 3rd, either manually or automatic. It isn't an every time issue, but at least every outting. I started with a fluid and filter change and the old stuff still looks and smells good. I'm trying to start with the more simpler/cheap causes as I don't feel it needs an entire overhaul. I've read to check the Throttle Position Sensor and the function of the Solenoid Valves in the bottom of the tranny. Any help/advice or guidance to a previous post would be GREATLY appreciated!!! Thanks