if its idling higher, surging and bucking on you the timing may have gone out of wach a little. that would affect the air/fuel ratio. making an improper mix with witch would make it bog out, sputter and act up on you. try retarding the timing via dizzy. if it makes it worse, try advancing it a little. also check up on codes, if you dont have a reader go to autozone. they check for free and print out. then again i could be wrong but thats all that comes to mind as of now. let me know how it goes. if i can think of anything else ill let you know. good luck