Engine miss and top end problems

Alright guys, need your help!!!
Had a shop put a cam and sheave in my 2012 Rhino from James, after wards it wouldn't idol hardly at all, but James said that was normal until my Dynatek and Bazzaz fuel controller was installed. Now it idols ok but has a pretty good miss between 14-20 mph, and my top end isn't where it needs to be, according to James. We adjusted the valves thinking that was it but still the same. I'm ok with the top end, but any ideas on what I should do or check?? James had me check my timing, as hard as it was to see, I think it is right. Maybe i need to go let a mechanic look at it. Lol. Any help would appreciated, thx, Randy.

You need to be positive your Cam is timed right before you make any changes, If your not sure about it have someone look at it for you. It could save you alot of trouble and time.

...did you do a throttle body too...check the tps if you did...call me....i hate when something just aint right...we will find it though..i will send you new boxes if i have too

The cam and sheave setup is flawless when everything is right. When you find and fix your problem, you will love it.