Problem more or less is:
Can only be started - occasionally - with gas peddle fully depressed
Flooding badly.
On rare occasions - less and less frequent - runs OK. Exclusively or almost exclusively only if from cold start.
Once from a cold or nearly cold start with air filter off, ran perfectly for about 20 seconds then saw both "injectors" suddenly increase fuel spray by about 5 times normal amount. Engine stalled as typical.
Anyone have and experience or ideas?