sorry if this is a dumb question, but heres my problem when im at idle it sits at 40 and the more i get on the gas the higher it jumps up and goes back to 40 when i let off, like when i really get on it it jumps straight to 80(and i know i fluctuates all ready but its doing it real bad now) , what does this mean? it never drops below 40 though, any help would be great