my car says cruise univalible and the car wont run cold, when car is warm runs,

What is your question?

when I start the car its as if the idle wont keep the car running, but its not when the car is warmed up it runs great when the gages are in the middle between hot and cold, and sometimes I smell a burning smell but I also didn't fix the gasket oil leak is this something that's going to cost a lot I had a mechanic say its electrical and that he didn't want to touch it to bring to jaguar, what should I do waiting.