my car over heats when is drivin in stop and go trafic but is O K on highway what might this be? Also my car will not start in park all the time but will always starts in netural what might this be? My car sometimes stalls in reverse what might this be? My car stalls every time i put gass into it what mgiht this be?

Optional Information:
1992 Saturn sl2 4-cly

Already Tried:
nothing