Just a heads up for everybody, I changed my small block Chevy to a single plane intake and it resolved just about all of my issues with the EZ EFI. The engine is a 383, 10:1, Iron Eagle heads, and 224 degree roller cam ground on 106. With the Performer RPM, it always it some off-idle lean issues that I battled for about 8 years. Light throttle tip in was also lean, as well as post shift (as soon as the trans shifted the engine would hesitate just a bit). Don't get me wrong, the car was enjoyable with the dual plane but it was never quite right. I tried everything to correct it and made several calls to tech support but nothing helped. With the single plane, everything has changed. No more lean spots, great throttle response and I was able to pull some fuel out of idle and cruise targets. For those of you who have issues like mine, get a single plane on there as soon as you can.