It would be helpful if you told us what make/kind of mower this engine was on. If it goes back and forth to which coil kills the engine. Try disconnecting the white? wire at the engine plug. (I know it is not the green wire, that goes to the fuel solenoid.) Keep in mind that you are now bypassing all the safety equipment on the mower.
What we are trying to do is to determine of the problem is on the chassis or on the engine. (I recall one Toro zero turn that was doing similar (But only one cylinder, it did not swap around) and the problem was a partial ground from the delay module on the chassis.)
If that doesn't make any changes, then I am pretty sure you have a fuel problem. Have you tried running it on a separate test tank with known-good fuel in it?
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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