i tried searching but i cant find the answer to my question... my car radio keeps turning on and off and sometimes the speedometer goes on with it and goes back up in a second ...it used to do this while i was driving in my old job which is quite far and i have to drive around 70 to 80 mph to get there in time but it rarely happens... after i quit it hasnt happened for 6 months bec i dont have to drive that fast to get to my workplace... last week i was in a hurry when i reached over 80 mph... all of a sudden my radio just keeps turning on and off and sometimes my speedometer goes down with it... and now even when i dont get to 80 its does it every once in a while... by the way im using my spare tires bec the other tire almost blew bec its so thin and i have been using the spare for a almost 2 weeks... im not sure if that has anything to do with it.. please help me and explain things or instructions to me like a kid... i have very little knowledge of cars.. please help.. i would really appreciate it... thank you....

 

anyone?