1996 Jeep Cherokee Clutch won't disengage when sitting at a

Transmission problem
1996 Jeep Cherokee 6 cyl Four Wheel Drive Manual

My brother gave me a 1996 Jeep Cherokee, manual 5 spd, 150K miles and it's having all sorts of strange shifting issues. At first I just had trouble getting from first to second gear and would have to double pump the clutch. Now it has started doing this strange thing intermittently. Sometimes I cannot shift from second to first and sometimes when I stop at a red light or creep through a drive-thru line the Jeep wants to keep going forward even with the clutch pedal down and my foot on the brake. It's like driving an automatic and hitting the brake and the gas at the same time. When it does this the only way to get it to stop is to shut the engine off and restart it or it will also sometimes stall itself when it does this.