I have a 1962 mf 50 4 cylinder gas continental. The other day it was running just fine and bush hogged for 8 hours no problems. Then it blew a tire and I had a guy come out and replace and fill new tire. Ran fine that day. The very next day I went to move hay and it wouldn't start. Finally did and ran very rough and died under power. Found a plug wire broke and shocking me. Went ahead and did some updates and changed all plug wires. Cleaned points of distributor. Cleaned and readjusted carb idle needle out 1 turn larger needle out 2.25 turns. Finally got it to start and it idled fine. Increase power and it choked out so I readjusted larger needle and no pRobles powering up. Go to put in gear and it runs very rough while the whole tractor shakes violently and sputters. Not enough power to do anything. Verified firing order of 1,3,4,2. Any help?