Hi Beammeup (I'll probably accidentally call you Scotty from time to time, but you probably expected that) and welcome to Outdoorking. You seem to have a good start with that machine: a Briggs engine, and a reel that looks as if it has never been sharpened, so it should last a while. It seems to me to have been a very good deal for $100, though it will soon become a worse one if you go to a mower shop for a simple engine tune. From your short description it sounds as if your speed control cable (it isn't a throttle control, it is a governed engine and the control lever just adjusts the set speed the engine is to run at) may be out of adjustment, or its lower end's cable outer may not be clamped to keep it from moving. Does the engine speed up and slow down when you move the speed control lever, with the mower stationary?