I have read around on how to fix this... but Im not sure if I should do it how others suggested it to other problems.

My car has a fine steady idle, but its a little low. I dont have aboost gauge quite yet so I cant be sure I dont have a boost leak, although I did a 40-70 time and got a 4.5 with everything stock except my apexi intake so I believe it is ok.

Right after I changed my plugs my idle was glued at 750, but after a few miles of driving it dropped and is now at a constant 600 or so.When the A/C comes on my car will drop to like 300rpm and then go up to the normal level of about 900rpm while the fans are blasting.

Should I adjust my idle screw? or do I have a possible small vaccume leak?

Thanks.

Stevo