Buick Regal 1994 transmition takes shift only when hot.

one of two things the transmission fluid pump needs replaced or the transmission filter is clogged replace it if the pump is bad a tranamission rebuild will need to be done also make sure your coolant is not low on antifreeze

the batt is suspect...take it to autozone, or other place, they'll check it out free......the shifting out of park is a seperate issue, the pawl for the steering/shifter is not working properly....did you notice if the steering wheel would turn when the shifter is stuck?....probably not....when this happens try to turn the wheel back and forth-not hard but not gently- a little graphite dust sprayed in there would help.......hope this helps you out

it might be a bad ignition moduale. or could be a bad ignition coil

Check the electrical connector above the modulator. If the connections are loose or the connector is damaged... similar things happened to mine.

change the tranny fluid and filter

mcdevito75 here, It"s possible the alrm system and the back fireing are associated, specially if the alarm (security system) is factory (built with the car) BEST BET have an auto alarm shop take a look, most auto shops that do glass, windshield, doors etc. also handle alarms.

The seals in the transmission In the clutch apply are hardened or have flipped over and cracked. A rebuild wil fix this.

possibly ignition switch issue, remove the lock cylinder and manually jump the wires, if that works, replace the switch

I am assuming you have the 200 4R, I just replaced my tranny fluid on my 87 GN, took about 6.4 quarts. I also have an external tranny cooler and let the tranny drain for about a week.

I would start with 4 quarts and start her up, dont drive anywhere. Keep adding and checking while the car warms up. Every now and then get in and shift through the gears, pausing in each one a few times, ALL GEARS. When the fluid level refisters on the dipstick, take the car around the block slowly at first then fast enough to shift into 2nd, depending on factors 3rd or 4th. Head home and leave engine running, check fluid again and adjust accordingly.

check the detent cable(kickdown) that runs from your transmission to your carb linkage. you'll need to "set" it by pressing the "D" shaped button n the bracket and pull the sheath back towards the bracket. turn your carb linkage to wide open throttle 1 time and your set. hope this helps....