92 Cavalier 2.2

92 Cavalier 2.2 used engine runs rough, 0-5 % leakdown, 135 pounds compression, new plugs, wires, crank sensor, will not idle runs very rich. Just swapped engine out, cat is clear, removed plugged muffler.

Replace fuel filter. Run some 'SeaFoam' through it. Also, possibly check coil packs. If it doesn't idle well, disassemble the IAC (Idle Air Control) valve and clean it along with the throttle body.