1999 Toyota Corolla 1999 Toyota Corolla Engine Acceleration

Engine Performance problem
1999 Toyota Corolla Manual

I filled my engine oil a few weeks ago and mistakenly left the cap off. I drove almost 100 miles out of town before realizing it. Ever since then I have problems with acceleration and sometimes starting the car. If I accelerate hard, it is as if the engine is either not getting enough fuel or misfiring. I'm not sure which, but I have to shift into a much lower gear to accelerate. There are also times when I try to start the car that it just won't start. Everything electrical comes on, but nothing happens when I push in the clutch. Any idea what the problem may be?