1. before it quits, give it full fuel, pulling the lever back to keep it under about 1200 rpms, and see if it will stay running.
2.after it starts and quits, climb down and give the priming pump on the back of the injection pump a dozen pumps. then see if it restarts.
i've got a 986 (4000, original engine) that will start and 20F, no plug in, no ether, but after it fires you have to hold the throttle wide open for a couple seconds( it doesn't overspeed cause it's still firing cold, smoking, etc). let it get up to 1000 rpms or so and you're good for the day. if you idle it down too early it'll cough, sputter, die and won't restart without the priming pump.
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