ya sounds like you could possibly have plugged injectors... hard to say how long was it since you had changed your last fuel filter since this most recent one??? cause alot of plugged injectors is caused by fuel filters not being changed alowing dirt and crap to get into the fuel rail, therefore interfearing with the injectors also causing stumbling, Because it is blocking off the amount of fuel flow.. run some good injector cleaner through it, should help def thats for sure 1 in the gas tank and another that goes through your vacuum line off your brake booster into your throttle plate a drip kit will get right to the source and help RIGHT away hope that helps my friend!