Depends on where Old checked the spark. If he checked it by testing the high tension lead from the coil and got a good spark it does not necessarily mean he would consistently get a good spark at all of the plugs.
I have a clip on by pass unit made from an old Toyota hybrid unit. It only uses the points in the distributor and bypasses the in house coil and condenser. I hooked it to an old misfiring Jubilee three times and each time it ran fine. When I removed it and restored the regular system it ran like crap. The mechanics said can't be the distributor. They fixed it by adjusting the carb. It ran okay a couple of days then went bad again. Problem was two new condensers. Old said the original condenser was okay. Intermittent failure of a component is a hair puller.
I did have an intermittent failure of a Lucas coil (Prince of Darkness) on an old Jag and it did run like Old's Ford. But his ford does not have a Lucas coil. Hence the joke.
Despite my stories I still think the majority of symptoms indicate the carburetor and if not then somewhere in the fuel system.
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Today's Featured Article - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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