While I was driving on the hiway for about 3hrs with outside temparature of minus 28c last night, I lost the control of engine speed. First I noticed that the accelerater padel felt light thanthe carcontinued to goalthough I released the padel. I thought I engaged cruise control but I did not. Istopped thecar with brakeanddrive it to thesideway and than put the gear into nuturalthan the rpm niddle went all the way to the red zone.I turned off the engine and pushed the accelerater padel but I did not feel anything as if the cable to the throttle was broken. I pushed the padela few times than it came back to life again. The same thing happend twice last night. Now I made an appointment for the service. What is the problem?