engine loping

I have a 1997 Ford ranger 4 cylinder, standard 5 speed. Engine will start but lopes or revs up and down. When the engine warms up it will idle but when you step on the gas it lopes again. Fuel pressure is up, changed the fuel filter,changed the spark pulg wires and problem persists.

do you drive it often and if you do are the trips short trips

It's a daily driver mostly short trips

Throttle adjust??

http://members.cardomain.com/12311974

You may want to put in a new "map sensor".

Thanks guys but I had to take it in and they changed the Mass air flow.