Clean the Mass Airflow Sensor with the proper cleaner spray, perhaps it has become contaminated and isn't sensing airflow properly. Any holes torn or worn into the air duct tube from the MAF sensor to the throttle body will give any engine a fit. All intake air MUST come through the MAF sensor (and not leak in past it somewhere). Another possibility is the throttle position sensor (the throttle body) isn't working properly. A diagnostic check of stored or pending trouble codes should be read from the computer and used as a guide to assist troubleshooting the problem.