I had this problem as well. I rewired the unichip, and reinstalled it without the emi adapter. I'm pretty sure all the wiring was good the first time though. Then, I found a little hole in the hose that runs into the bottom of my mbc. The one with the little brass restrictor in it. Anyways, I replaced that at the same time. I'm not sure which fixed the problem, but I haven't had any problems since.