Engine idles at 1,000 rpm, the normal range is 500 rpm

My car always stays at 1,000 rpm when I start it. I think the guy adjusted it like that because it was tuned rich with a p28 ecu on chrome.
I heard that the best rpm to set for idleing is 500. What do you recommend for a B16A engine? I dont have any problems with idling or with my engine.
I tested to see what transmission I have. I was going 80 MPH and My RPMS was at 3500. So I have a LS tranny. But since my car automatically jumps to 1,000 RPM when I start it does that have mean I have to add 1,000RPM to my 3,500 RPM? (which would mean 4,500 rpm = Type R tranny) (I dont think so)
I heard that the best rpm to set for idleing is 500. What do you recommend for a B16A engine? I dont have any problems with idling or with my engine.
I tested to see what transmission I have. I was going 80 MPH and My RPMS was at 3500. So I have a LS tranny. But since my car automatically jumps to 1,000 RPM when I start it does that have mean I have to add 1,000RPM to my 3,500 RPM? (which would mean 4,500 rpm = Type R tranny) (I dont think so)