can any one talk me thru changing the timing belt and also tuning the carb as the idle is all over the place . its like the throttle is sticking, it revs high, then if you blip the pedal i t comes down to normal but slowly revs back up and its drinking petrol like a demon. there is also screeching sound coming from the engine ,i thot it was the fan belt and so i took it off to see if the noise dissapeared but it was'nt. i seems to be coming from under the timing belt cover. to me it sounds like a dry bearing maybe on the tensioner or water pump. so can anyone help please? oh yeah car is 1992 1.0 k10.