throttle sticking on 2002 Cadillac DeVille DTS

the throttle is sticking after warm-up (3000 rpm) or 55 mph in top gear. I lubed the exposed throttle shaft with wd-40 but no difference. I can shift to neutral at stop lights, but at 2000-3000 rpm it is quite a jolt to engage transmission to resume my journey. Any recall you are aware of?

Asked by for the 2002 Cadillac DeVille DTS
Shifting into drive at 2 or 3000 RPM is harsh on the transmission, I wonder if you have a vacuum leak, but what ever the cause is it needs to be checked out as soon as possible. Is there a Check Engine Light on? If so codes would be stored in the computer of your car which would indicate what may be the cause. I don't see a specific recall for this fault.