it should have plenty of power (133bhp new).
Have you given the car a good service, it maybe something as simple as old sparkys that are causing your power loss.
Air filters blocked is another thing to really lower the performance, get a new one or put a good alternative on (ive got k&n in my oil burner and it made a big difference).
Another thing to do is give the throttle body a clean as a build up of carbon etc on the inlet will also restrict the engine power.
I regually run a fuel additive on my car, this keeps thing running well, maybe a bottle of redex could also be in order.