I have a 2002 Mitsubishi Galant I4 Auto. I took the car for a timing belt change. When I drove home from the freeway, the engine sounds like it's under pressure. Under stres.. Sorta like groaning. Any help?

 

hmmm. could be too tight. (bad tensioner)
or could be one of the other belts that drive the accessories

 

someone did not install the balance shaft(s) in correct synch.

Ill bet you took it to an independant shop, didnt you? At any rate, it needs to be taken apart and reinstalled correctly.

 

Well after i got my galant turbo'd it felt like it was running underpressure.. anyways it never groaned at me but one time i made it read me the whole harry potter book series one time when we drove up to the great salt lake to visit the MORMON TABERNACKLE TEMPLE ON MORMON STREET!