Engine Mechanical problem
1991 Isuzu Amigo 4 cyl Four Wheel Drive Manual 148,00 miles

I can drive the car in the morning with no problems. but if i stop, the idle speed goes down and, it the gas pedal doesn't seem to work. i have to pump the pedal quite a few times to raise the engine. even then it jumps like it's not fully in gear. when i depress the clutch a gun the engine it moves. whats the problem.