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ALWAYS check your tune-up first when you have an engine miss/poor peroformance. Takes only a few minutes and you have to rule tune-up problems out first before starting elsewhere. Points slip on these tractors often and it'll do it between one start and the next. I wonder whether your dist is worn. It'll cause that sporatic miss and slipped points. Pull the rotor off and move the dist shaft side to side and check for play. Shouldn't be any. Only 1/8" up and down play. After tune-up check, pull plugs and observe spark. Should be whiteish/blue. If not, one of your ignition components is failing or shorting. If tune-up doesn't fix, realize that poor carburation/governor do NOT cause AFTERfire. "Backfire" is thru CARB and wouldn't be loud. Afterfire can only be caused by pre-ignition (poor gas or timing incorrect or dist shaft worn or incorrect firing order or burned/stck exhaust valve). Definately check for chewed wires as Rusty suggests although it's hard to believe that it ran fine earlier in the day and now it isn't due to chewing in that time gap. If none of above works, make sure gas filters are clean. If clean, shoot some starter fluid in each cyl and see if it fires up better - will indicate fuel supply problem. if all of above is okay, time for a dry and wetcompression test.
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