Speed Control Springs Problems of Audi A6

I have an Audi A6 2. 8 1998 during the winter 2003 I was driving during the morning the car was on for 20 minutes and temp was 14 degrees f. Speed was 65 mph as I approached my exit. I let off gas an car accelerated pushed brake down. Car came to stop but idle was at 1800 rpm and car wanted to lurch forward. Made it to work 1 mile away brought to mechanic and he found no problem but he did clean the throttle body. No problems , for 3 weeks. Event two: going home 6:30pm temp 15 f speed approx 60 mph going up hill. Car started pulling faster. Decided to pump gas pedal figuring stuck cable just went faster. Decided to see if would stop at specific speed approached 95 mph realized car would keep going. Stepped on break, pulled to side finally came to stop. Turned car off , waited 30 secs started car. Rpm out of control. Turned off car and waited 5 minutes. Turned car on, no problems. Went back on my way happened 3 more times that winter. Temp is always between 14-17 f car is always warmed up. No problem during spring, summer, or fall year 2004. Moved closer to work, car ride never longer than 10 minutes. One time car on hill doing 65 mph speeded up pulled over turned car off waited 6 minutes (timed) turned on car no problem from my results car problem always occurs when temp 13-17 f car is warmed up if problem occurs pull to side of road car is stopped but rpm 1800+ turn car off wait 5+ minutes start car no problems.

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