[Scott]

Could be a problem with the vacuum hose to the cruise control unit. This happened with my B13 a while ago because the vacuum hose had been knocked loose.

 

[Scott]

where would I find the vacuum hose?

I've attached a picture of the unit in my B13. It's mounted on the firewall on the driver's side. From what I've seen the B14 is essentially the same. You can see the vacuum line on the right side of the picture, with a cable on the left that goes to the throttle. Check and see if everything is still hooked up correctly and that the vacuum line isn't cracked or something. I had the exact same symptoms as you when the vacuum line was accidentally knocked loose.