I normally run about 400 mile to a tank of gas, I have a AT 01 SC2 with 35,000. Just recently i've lost gas mileage, I now get about 200 to a tank. My car also is idling at 2000 every once in awhile.. What can be wrong?

there's lots a probable cause for low mileage. in my case, always
happens when i have a messed up air filter. maybe you could start in
there.

I have a intake, I checked my plugs, and they were at .050 so i regapped them so hopefully that will help. my car was idling above 2grand and after the regap it gropped to 750