is the lean buck while driving or idling? (Or like 3 seconds after hitting a button)
It can be at either time
every once in a while, while saving the settings to memory (3 seconds after you press a button) the unit has to clear a page of memory to save to. When this happens you will feel a hiccup. If the car is idling it may stall. This won't happen if you're not tuning.... (I'll fix this in a future software release)
This makes complete sense now, because while trying to tune it would do it, so we tried to reproduce the hiccup so we could log it. Well whenever we did this, the car would drive with no problems at all, so we'd go to make an adjustment here or there and boom, lean hiccup again. Eventually we got a log of it, @ 40% throttle i was making 7psi and the car went straight from 12.1: 1 to 15.2: 1 and back down again. After this incident I called it a day as somethign like that could be quite catastrophic at WOT and a higher amount of boost. Now i see that i should make a run, log it, make a change and go make another run. No more tuning on the fly until you take care of that bug 
FYI...This NEVER caused me to get any knock counts at all which is good
Did you load the tunerpro that was included with the unit?
Yes v.4 i believe
Do you have any palm sync software running?
It might have been running in the background i'm not sure (no palm was hooked up to the laptop though)
what brand of usb converter are you using?
Its my neighbors that ive been using for the past year to tune my emanage. It doesn't have any brand name on it, the drivers indicate that its "USB v1.2 cable" so its probably some generic thing. i think im gonna get one for myself though, any brands you recommend? where did you get it from?
Colorado As far as tuning difficulty, id rate the MAFTpro 8/10, afc - 5/10, maft 3/10, Emanage 7/10, haltech (standalone) 9/10
the afc and maft are pretty easy because well the maft is just 4 nobs and the afc has everything right there.
the emanage is a little tougher because you have to get it to connect to your laptop, messing around with comm ports and stuff, then theres a lot more variability on what you can do. you can tune by boost vs rpm, tps vs rpm or airflow vs rpm and you can also change timing.
the maftpro is even tougher because it does a great deal of logging and tuning with the same software. Theres a little more of a learning curve than with the emanage but in the end your better off. And theres a lot of adjusting minor things like throttle tip in enrichment, auxillary rpm engagement (for my water/meth), then IMO things like a wideband are absolutely necessary with something like the MAFTpro.
the haltech is a standalone ecu, basically its like the AEM, you have tons of stuff to setup to get started, you have to run a strong ignition, wideband, map sensor and other stuff are all necessary. You tune on a 3d map of Boost vs RPM vs TPS, so its difficult when you're first starting off, but once you get the hang of it, it allows the ultimate in adjustability and accuracy (there is no tricking the stock ecu into thinking its getting a particular airflow value)