1994 Pontiac Grand AM fuel system problems

While driving at 50 MPH, noticed vehicle started to lose power. Also, the automatic locks will lock only with vehicle is put into motion; and when trying to use the switch on the door, it doesn't work. When putting on high high beams they will work, but when cutting the high beam off, the regular lights won't work. It takes along time for the consumer to get the lights to work.

Purchased vehicle, heating did not work - air would blow out cold. Dealer blew out heat core and replaced thermostat. Minimal amount of heat. Engine started to stutter and stall. Fuel injector in 5th cylinder bad. Mechanic flushed injected and gave tune up. Ran ok for a week and then constant stutter and shake at 50 MPH. Mechanic replaced 1 injector. Stutter gone. No overheating, but antifreeze leak x 1. Replaced water pump. 1 week later constant overheating and puddle of antifreeze around engine block.