for the past few weeks my handbrake light has been comeing on every now and again for no reason ive checked my fluid and the plug going to the master cylinder and all ok it normally just flickers for a second then goes,but tonight after leaving work i floored it and pulled at some lights and it came on again and stayed on for about 3 or 4 seconds and the engine wanted to stall and went lumpy i revd it and the light went out and the revs went back to norm anybody got and ideas????????????