Don't really understand that part about the gasser not having enough power.
Is it running right? Have you done the required maintenance on it?
If it's a early 5.4 V8 or a 6.8 L V10, lack of power could indicate any number of things.
Coil on plugs are functioning right?
Have the spark plugs been changed lately? It's not just miles often, it's also time.
Check the spark plug wires. Is the resistance in spec?
Have any of the plugs blown out of the head? (a common problem with early 5.4 and V10).
Tranny and differential fluid color looks ok? Have they been changed lately?
Either the 5.4 or the V10 should have plenty of power. Do you need to drive 75 mph up a 7% grade?