Depending on loadout and if it's an F-15C or E, the plane pretty much quits flying somewhere between 130 and 170. It doesn't have a conventional "stall" as you can hold the stick full back in max AB and pretty much just flop around down to around 120 knots, but at that speed it's not very controllable and depending on gross weight it could either climb or descend like that.
Below 150 the plane handles pretty poorly and we only slow down that much when we have plenty of altitude to recover from mistakes, or when we're landing.