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Tom, it sure sound like a fuel flow problem but if you are sure you have good flow for 35+ seconds it must be something else. ~Try opening the load needle about 1/4 turn more at a time until either the problem goes away or you get it open 1 turn more. ~Does putting the choke back on a little [or more] help the problem [if so suspect fuel flow or carb problem] ~If the carb or choke doesn't change anything, use a volt meter & monitor the coil's ignition side terminal while driving the tractor to see if the coil's supply voltage is dropping or acting up while driving, if so, run a jumper wire from the starter battery cable stud to the coil's [ign switch terminal] & see if the problem goes away [if so suspect a faulty ignition switch or poor connection in the ignition feed circuit]. ~Make sure the distributor has a good ground through the hold down clamp. ~Install a new condenser [preferably an original Deere style that was used originally, some of the replacements aren't quite right] ~If nothing shows up by doing the above, try trimming about .020"- .030" from the end of the distributor rotor to force the spark KV to build higher before jumping the plug gap [that can sometimes do wonders on the Dubuque's]. ~If nothing found so far you might try a new ignition coil [just to eliminate that]. ~If all the above has no effect maybe you a sticking valve or muffler baffle that's moving around & shutting down exhaust flow [long shot]... ~If by chance your tractor has been converted to 12 volts post back as that opens a whole new bag of worms..... ..
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