I installed a Magnuson SC on 2007 GMC Denail and loaded the tune from Magnuson. Engine starts up and runs fine. The throttle is a bit touchy and the rpm's surge a bit, difficult to drive steady at 20-50 mph. Any ideas?

Also, the stability track system turned off by itself driving steady down the road at about 60mph. I can't seem to turn it back on. Any ideas?

I've only got about 20 miles since the SC. Have not stepped on it yet. Trying to work out all these little bugs first and make sure all good.