After installing a new gas tank, adding PS, and adding front disk over the last three months I attempted to start the 1974 FJ40. It did run but very poorly with lot's a stalling and coughing etc. To keep it running I had to feather the gas constantly. My best guess is that I knocked some nasty stuff loose in the original gas tank when I removed it and those particles lodged in the carb? Where should I start? It has a rochester 2 barrel carb. Is this a carb with a bad reputation? I was planning on simply doing a carb rebuild and a full tune-up. If that doesn't solve the problem I was going to a full valve adjustement? Suggestions?