shivers had this exact same problem. Your manifold is not bolted on all the way or the intake manifold gasket or tb gasket is no good. It's just sucking air in and not using the tb plate to restrict the air flow. Double check that all of the bolts/nuts are tight on both the intake and the tb.
Originally Posted by Kabooki
think after puttin a cai or header you gotta unplug battery so ecu can redetect all new mods
Sorry, that's :bs: