So I just had a new motor built and installed, changed a lot from my old set up which didn't have too many issues other than the fuel pump wasn't able to keep up. I was working on some tuning and break in driving everything was going pretty well, untill I manually down shifted the car. It developed what seemed like a dead miss, I started nursing it back and then after letting off the throttle for a bit and letting the auto shift take back over it cleared up and drove normal. Everything seemed to be fine till I down shifted it again and the miss was back, again I left off and it seemed to clear up shortly after. I noticed when the miss comes into play the car goes dead lean, and spark becomes very erratic. Any thoughts on this being trans related or coincidence it happens when manually downshifting?
Attached log and layout let me know if I'm missing anything in order to view properly. Example is at 19.47, just down shifted it from 6th to 5th and you can see how it goes lean shortly after and spark goes crazy. I let off the throttle at 20:37 and it smooths back up right at 20:40. A 20:46 i downshifted it from 5th to 4th and again almost instantly it develops the miss and goes lean.
Any thoughts?