just bought 2000 mustang v6
 

i wanted to know if anyone knows how i can adjust my rpm idle runs very high at about 3000 to 3500 the car is 5 speed

Welcome and congrats on the new stang. most likely you have an air leak somewhere. un metered air is getting past the MAF and making the computer think it needs to run the engine that high. not a gurantee that that is your issue, but its a good place to start looking for problems. The MAF itself could be bad too.

Welcome and I second checking out the MAF. Do you have any pictures of the new ride?