I have a 2000 cavalier with a 2.2 liter engine. last week the it didn't want to start but after it did the theft, service engine and battery lights stayed on. the battery was 3 years old so i replaced it. Yesterday it was slow to start again but after it did the gauges wouldn't work and i couldn't get it out of park. finaly i got it to start again and everything was fine. any ideas would be welcome.

 

Bad battery cables. Bad engine ground.