HELLO I am new to the site so please do forgive me for being a newbie and if i post something in the wrong place just let me know so i can learn and fix my mistakes.. also sorry in advance for my dull witted line of questions but i am trying to cover everything possible to get this problem...

This bike has been an on and off pain. It starts up just fine and idles just fine, though it does need to idle high (4-5k rpm) for warming up, but it's old and I expect that. When I take it out on the road, it'll ride fine for a bit, but then it seems to bog down when I roll on the throttle at...