Hopefully, you installed non-resistor spark plugs and copper core plug wires, but I really don't think that is the problem here. What I think might be happening is that since the engine has been setting for so long, there is now some rust in those cylinders, and of course there is always a carbon build-up. I think little specks of the rust and carbon are breaking loose and then lodging temporarily in the gap of your spark plugs. With the actual compression as high as it is, those specks are eventually blown out, and then all is well again for at least awhile. The solution might be to get the engine good and warm, and then make it work hard for 30 minutes or so.
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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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