I have a 2011 Hyundai Elantra with 140k miles, it hesitates when I push the gas pedal past a certain point. Sometimes its so bad the check engine light comes on and off with it, I changed the transmission fluid and changed all the spark plugs, put in a new crankshaft position sensor as I was getting an error code from it. The air filter is less than a year old, battery is brand new as well. I have run several bottles of pea fuel cleaner through it as well just to make sure. I am thinking it might need a new fuel pump as it has never been changed. Any suggestions?
@ganzai
check your mass airflow sensor and your map sensor. have you checked your oxygen sensors?
@reddevil1321
The oxygen sensors are fine, no codes or anything and they are clean. Mass airflow I hit with some cleaner twice but I have not checked the map sensor.