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Take each plug out of the head. ( 1 AT A TIME ONLY ) and have assistant turn over engine while you look at the plug. No spark = bad module. Or while engine is running plug plug wire from the plug ( 1 at a time ) a good working plug/ module will cause engine to running crappy when wire is removed. If you pull the plug wire on a plug that has a bad module the engine will not change in sound or idle. That's your bad plug/module. That's for engines with module/coil per cylinder. For engine with 1 module for all cylinders use a volt/ohm meter at the module . You will need to know the required ohm/resistance to know if it needs replacement .
can't say for sure but almost all engines that have come to me needing ether to cold start have poor compression. test the compression first.
you sould never need to use ether on a gas engine and very carefully on a diesel when very cold.
The coil pack on these are bad about being defective. You need to check to see if you have power coming from your coil pack. If you do not try changing it out, this produces 60k +/- volts that goes through your ignition wires, to your spark plugs and ignites the gas on combustion with the piston. If it's not giving off a spark, thenyou're not getting power to fire off the engine.