My first thought would be like yours since you were in the engine I would be going back and verify everything as well. Having said that, I have never determined how a mis-fire is actually sensed. In my daughter"s VW Jetta it seems to be only related to ignition signals. She had a CEL on with a cylinder 2 mis-fire reported. Changed plugs with no effect, went on to wires still not getting improvement. Now codes are also reading a cylinder 4 misfire. Find out that in this ignition system cylinders 1 and 3 "share" a coil as do 2 and 4. Replaced the "coilpack" and CEL went away and mileage improved from 25 mpg to almost 27. Your situation just reminds me of this so I would remind/recommend that you go through ignition.
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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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