If you heard a 'pop' from the engine compartment and now your 1988 Olds Quad 4 2.3 is out of time what should you do?

sounds like the timing belt jumped, they suck to do, hopefully you are lucky and did not bend valves Check your compression on all cylinders you should have about 140psi in each one.

Quad 4 engines are picky. Find another car. Putting any investment into your 1988 car is a waste of money, unless it's a collectors' item or has tremendous sentimental value. Finding junkyard Quad4's is also near impossible.