1993 Chevy Truck

Engine Performance problem
1993 Chevy Truck 6 cyl Two Wheel Drive Automatic

my truck runs great when it wants to. When Im driving it acts like its flooding itself out until I hit a big bump then the engine takes off, then back to running like crap. I have to drive with both feet even though its an automatic, if I dont keep giving it gas it will die but I can restart. Could it be a sticky egr valve or could the exhaust also be resttricting flow because itts pretty rustty with holes. I need help because I love my truck.