Car is a 1995 S320, 117 kmi. besides the noted issue it runs great. It has lately been down on overall power. Acceleration is suffering and even putting the pedal to the floor to down shift, feels delayed and weak. Thoughts? Fluids are good, plugs good, filters good, I think I need to get a air inj. pump soon. I only mention the air inj. pump because on a preious car I've owned, I had eliminated an inj. pump and the car ran poorly.

Please post.