Car is an 07 limited coupe, 6spd. 38500 give or take.

The other night I was on the way home doing about 75 and went to put the cruise control on and nothing happened. The car acted like it was going to hold speed, it sort of lurched everytime I flicked the cruise control stalk but wouldnt stick.

So I slowed way down, up until 50 it works just fine, but wont engage at all after that. I've tried engaging it at 45 and bumping it up past 50 with the accel part of the stalk but as soon as I get over 50 it cuts off.

Car doesnt throw any codes, so I'm at a loss