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Q: throttle sticking on 2002 Cadillac DeVille DTS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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?
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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.
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