Thread: P0171 set on decel//update has another code

So i installed my Dynotech Transmission today.I had zzp program my pcm for the 3.29's,42.5's and the other basics that come with their pcm.I am setting a lean code on decel.Any way to fix that?More of tuning issue?My car has never set that code before untill i installed this pcm.I also checked all the vac lines.I am running good on wot.But once off it goes lean.The code was set at 1000rpm with 1% Throttle angle.When i had my buddy watch the tech 2 he said it was going lean right after i let off the gas from a wot run.