HELP!~!~!~!~Won't run~!~!~

I need help~!~!~! Im going to Utah next month and I can't seem to get my 300ex in top shape! at about 3\4 to full throttle it blubbers but it does'nt have anything to do with the jet I'm pretty positive ( I have jet #118 {stock is #122 and high altitude is #120} and have cleaned the carb) I think it might be something electrical but i can't find out. If anybody has any suggestions i would love to hear dearly!~!~! (ive also checked the valve clearence):confused:

[400exdad]

Change the plug, check the connection at the plug too. Maybe something is loose in the spark plug cap. I would think though that if it were electrical it would most likely be worse in higher gears or more load. If it goobs up in all gears without changes in load, I would probably look at the carb./air filter box.

spray all the conections up with a silicon spray and clean them