i just installed a skunk 2 intake manifold and im throwing a iacv code.. my idle stays at about 1,000 rpm when i crank it up and then after i hit the gas it stays at 1500 rpms and no lower.. and also when i hold a steady idle at about 3000 rpm my idle bounces like i have a rev limiter or something.. what could this be.. i tired to change out the iacv and it still does the same thing.