Stillen Supercharger help

[Genie0311]

Hey guys I'm having some problems that maybe some of you can help me out with. First, the check engine light is on. I had it looked at by a damn good performance shop down here in NC, the codes are reading fuel bank leans but they looked at it and determined that the tune is messed up and that's what is causing the light to come on. But its the uprev tune that came with the kit. I just retuned it last night with another tune the disc had on it after I installed my exhaust, but that didn't do anything for it. It idles like crap in park (it's an automatic). And put it and drive and let off the break, it'll start accelerating all the way to 3rd gear without touching the gas. Really annoying in traffic and parking lots. The car overall just seems like its really lacking in what i feel the performance should be. I called stillen several times, and they keep telling me to call back when the supercharger tech comes in. It's an overall frustrating situation and any advice is greatly appreciated.