1999 Saturn SL2 power lapses

Engine Performance problem
1999 Saturn SL2 4 cyl Front Wheel Drive Automatic 130k miles

the car starts out fine and then after a mile of driving, it lacks acceleration. It surges and will only accelerate at highway speeds if I push hard enough to kick it into overdrive where it too will eventually begin to surge. After reaching cruising speed, I feel no problem until an incline where again I need to accelerate. 0 - 30 acceleration is also poor. Replaced coil packs, plugs, wires, and the VSS on the transaxle. Help!