1999 Plymouth Breeze stumbles on acceleration

Ok, so, my 99 breezes timing belt recently broke. Due to a water pump freeze in sub zero temps. I got a new water pump, timing belt, tensioner, idler, and because of an upgrade on the tensioner a new 3-piece timing cover. Installed by a proffesonal because I dont have the tool for working on this or much knowledge with timing. On this type of motor they said valves could be bent but since it was only ideling when it happened chances were small I was told. Got it back and they said it ran good no problems. But since then I have had a poor idle and it stumbles upon acceleration. Could this be a crankshaft sensor?Vaccum leak? Mass airflow sensor? Fuel injector? I also replaced spark plugs, fuel filter, and did an oil change just to rule out a few things. No oil leaking so I dont see it being head gasket. Thanks for your time and energy with this question. Rick