93 GA misses

I have a 93 GA with the quad 4. Some days it runs perfect and others it misses. When missing it seems to make a difference how you press on the accelerator. At a light if you push the accelerator about half way it might miss. If you let up until accelerator is only about 1/4 way down, it will catch and run well. i checked codes and got a 34 and a 66. Any help would be appreciated, Thanks.

anyone have any idea?