does the machine spin with a load in it? capacitors can be weak that is tests ok with a meter but not put out enough of a charge to spin. if its loaded it will just go round 1/2 a turn and then fall back if the capacitor is faulty.
check the heater if there is no circuit through it or has a short it can cause spin proplems.
another thing is that the belt should be really tight also causes spin problems.