96 Scrambler running issues

HI guys. I picked up a scrambler that has been sitting for awhile and trying to work out the bugs.

Ok so it’s a intermittent problem. at first it was running ok but now when I try to rev it up in any gear it doesn’t get Far past idle. There has been a few times it will take off with plenty of power then back to idle. carb is clean. Compression is good. I am not sure if it is a ETC problem. Is there a way to bypass for testing? one of the times I hit the override and it took off but it only did that one time..

Could use some guidance.

Thanks guys