Sorry 200,000 miles new plugs and wires cleaned all the sensors, coil pack does not surge when idling or does not surge in park at 1500 or above rpm’s.
Only under a load and when the rpm’s reach 1500-1700 or above it starts surging and bucking.
I figure fuel pump, but would hate to buy one and not solve the problem.
How many pounds of pressure does the fuel pump need to put out and is it different under a load?