okay, i put my shorty header on like a week ago. and i didn't really take it on a test drive because the auto hobby shop is like a block from my dorm. anyways, my car sat there for like for the entire week without me driving it (thanks to the damn base security police). so i go out there last night and drove it a couple of blocks. it sounded horrible. like one of those old 1984 pickup trucks. and my idle is shitty. and to add insult to injury, when i returned to the dorms, i pulled in the parking spot and my idle dropped down so low, my car just died. it started up just fine but the idle is still wavering ugly. i'm thinking i didn't tighten up all of the bolts well enough somewhere because it sounded like there was exhaust gases escaing from under the hood. would a leak cause a drop in backpressure to where my car would stall out? i need help because i'm taking leave for mardi gras and i can't have my car being stupid on me. someone help!