Ok, Put the Lt1 in Hot can kit etc. etc well it Idle with the Maf off checked and found I didn't plug the vac. port under the throttle body so i pluged it. before I was noticing a pre ignition noise when I wen't to rev it up a little.. Its doing the same thing. but now when i have the Maf hooked up it still does it and will die after a few seconds if you arn't holding the throttle and it gets louder. Please help I can also tightened up the rockers a little, so there not as loud. well there's my problem. but i look on the bright side at least it runs .