I have a late 80 early 90 buick regal (looks like the olds cutlass calia ) its been parked in the back yard for over 5 years. need to know what to do to bring it back to running condition. its a 4 banger so its what I need and it was running good before my parents parked it after my aunt quit driving. car is in sound condition. never burnt oil. I know I should do a pistion soak through the spark plug holes but dont know how to do it. so some steps of what to do will apprishate it guys and gals.