358.797991-32cc Won't start. will run with choke on for 2-3 seconds and then dies

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Fuel starvation, start by replacing the fuel filter in the tank, check the fuel hoses for leaks up to the carb.

You are on the right track by finding the injector pulse missing.
The computer grounds the injectors based on signals from the cam and crank sensors. You may have to use a scanner to check for trouble codes in the computer and watch the sensors work.
The problem could also be a relay or the key switch.

Probably gummed up carb. If you don't want to try to rebuild the carb, then try adding a really good carb / fuel injector cleaner to the gas/oil mixture. don't forget to use a very small amount, then run the motor as fast as it will go for short periods of time to try and dissolve the gumming in the jets.

Hi, Replace with correct sparkplug. You have a bad plug replace it and you're good to go.

check fuel pressure, should be 40 psi.
try 2 things

spray starting fluid in air intake to see if it will stay running. It's fue then.

Try turning key to on nd wait 5 seconds for system to build pressure and pump to shut off. Turn key off, wait for relay clcik noise or 10 seconds. then turn key to ON again and wait 5 seconds to build pressure again. Then start engine. If it starts better, you have a bad check valve in the fuel pump or a bad pressure regulator on the fuel rail (unlikely).

report back

You probably either have too much gas or not enough.
If there is too much, the plugs will be wet, and you need to burn it off.
The full choke should not be kept on long, and you could also have an over flowing needle and seat in the carb.
If there is not enough gas, then you could still have a bad needle and seat, but could also have a bad fuel filter, bad tank vent, of you have water in the tank.

Sounds like your choke is stuck open

Most of the small outdoor power equipment that I have used takes the following to start:

1. Prime 6-8 times, or whatever the manual calls for.

2. Choke the carb to full choke.

3. Pull starter rope. It may sputter and die.

4. After it sputters and dies, put the choke on 1/2. Pull a time or 2 more and should start. Run like that 10 seconds or so, then take choke all the way off.

Sounds like your flooding it out with the choke out. Try the next time you go to start the bike when it's cold with the choke out and when it starts push the choke all the way in and keep it running with the throtle. If it runs better after doing this then your flooding it on start up. Use 1/2 choke to start cold and see what it does. Good Luck