MXC 180 nytro stumbles at 3500rpm

[Guest]

Just had a MXC 180 kit installed in a 2010 Nytro sled starts fine but after it warms up idles from 1450 to 1530 (hunting). as you give the sled throttle it cleans up until about 3500rpm and it stumbles, push a little more and the sled runs fine. If you hammer the throttle it also runs fine. I've eliminated the TORS, checked all sensors. Dealer is 5 hours away. Any help would be muchly appreciated.

 

[sonds]

Check all grounds, just had this happen.

 

[180 nytro]

Make sure your ground for the mcx box is grounded directly to the battery.

 

[180 nytro]

Does it have a code flashing at all?