2.3l 8 plug timing question

[magna19]

got one,hard starting for the first time during the day.but it doesnt rev up like it should,stumbles and spits,no check engine light on,was on,but solved the problems,coolant sensor problem.but i just found out the timong belt was chamged recently,but dont know why or when.wondering if it was put on off 1 tooth or what.would it cause the situations mentioned?going to rip it apart soon to see if it was.