Hey everyone I'm new to club and the whole ke corolla seen but ive just got a 1975 ke30 rolla with a 3k-h motor and i need help finding out whats wrong with the motor. The motor has a exhaust leak at the manifold, on idle it only runs on 3 cylinders (2nd from the front not firing) but when it's reving more it's firing on all 4. i have checked the spark and there is spark coming from the spark plugs but to me it doesnt look like much. Does anyone have any ideas what it could be ? Any help would be greatly appreciated