Slow to shift out of first gear

check tranny fluid level,if good,either pump in tranny is bad or cluthces in tranny is gone bad,how many miles?

Most likely a shift solenoid in the transmission.

Check the adjustment of the transmission T.V. cable. Sometimes they also stick. Try driving it at 30. Shift to Neutral, stab the gas pedal to the floor quickly a couple of times. Then shift back to drive. Then see if it shift normal.

try to reset the computer if that doesnt work reset the idle speed it may have picked up bad codes

converter came loose

Have you checked the transmission fluid?

You rear planetary set is worn from a restricted cooler.

check your fluid level when the car is warmed up

ummm i would say you need to adjust your trans shift cable, check your fluid level, and the problem i had with my dodge was similar to yours... it was my 3rd-4th actuator spring, it had broke and couldnt hold the pressure to keep it in gear

one unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well