[DUBIE]

ok i have a 96 dodge intrepid 3.3L and been having problems since last couple of 2 years...i fix the problem then a year later i get the same problem once again...the problem is that the car stays in 1st gear when its HOT or sometimes it pushes it self when im stoping for a stop light....then now like couple of months ago i have hard times turning it on....i changed the transmisson computer so many fudge times......i never upgraded or bought a new computer for my (ECM) engine control module..i was thinking on changing it to see if that would fix the problem....what does (ECM) control?..i heard for motor,ignition,also for fuel pump....anybody know?..any help would be great!...