93 SL2 stalling

My 93 SL2 is stalling when I am shifting from park to drive as well as when you brake hard.

I have recently changed spark plugs, pcv valve, replaced the CO2 sensor, does anyone have any idea what is wrong????

any slaming into gear? how old is the fluid? ever replace the ECT? ever cleaned the throttle body?

What is slamming into gear, and which fluid should be replaced?
No I havent replaced the ect or cleaned the throttle body.

by slaming i mean you feel the car jerk or "slam" into gear

i'm talking about the transmission fluid