I had that Engine Power Reduced situation a couple months back.
My car had no power at all. A ford Pinto was probably faster at that time. It wouldnt start and the engine doesn't crank. But after LOTS of try to turn it on it did.
I drove it on the exspress way to the dealer and it would barely go 60mph!
A week and a half later at the dealer they called and said that all my wiring was fried??