I have a 1990 Accord 4 door I recently purchased. Having some issues.... Brake lamp stays on and s light flashing. Speedometer not working. I put a new speed sensor, passed emissions. I ready on one of my google searches about the trans control unit/module... May cause these symptoms my car is doing. Anyone can tell me symptoms of this? car shifts into gear kinda hard, idle bounces up and down lightly when foots off the gas

 

Welcome to HaF! I moved your post to correct forum to get support.

S-light flashing means that a trans code is stored. See DIY forum for procedure to extract obd1 codes. This will provide a clue to your problem.

good luck