I just purchased a 1955 olds 88 that drives well , but has a bad miss at idle. Has new carb, timing is set at the middle mark on balancer, Vacuum gauge fluctuates badly between 8 and 15 inches at idle. Manual indicates that could be late valve timing. Does that mean a bad timing chain or some thing else in the valve train system? Where should I start the process of eliminations?
thanks Lawrence