Megasquirt PNP2 turbo foxbody dead spot at partial throttle.

Ok lets start from the top..

The tune needs to be cleaned up significantly, the AFR table makes little sense it needs to be flatter in the idle range you should look at some of the tunes I have helped people with to get an idea of what is normal. Your VE table needs work mainly because looking at the datalog I can see that when you raise the RPM it goes full lean the WB reads 19AFR nothing will want to run at this AFR unless its maybe a direct injection engine. You will have to manually add fuel in this area, if you are trying to rely on autotune to fix it dont.... autotune works very well but when the AFR is "out of range" then it will ignore the input as it may be erroneous data.
Your Ign table is far too aggressive in the decel [low KPA] areas and I am not sure why you are trying to command 0 degrees at the top of the RPM range.. If you want to cut spark do it in the Rev limiter section under general settings. A word of advice, the MS only commands the advance value it cannot cut spark on a TFI vehicle because the TFI is what fires the coil. When the MS tries to cut spark the TFI just fires at the mechanical advance like you pulled the spout You cannot command a value lower than the offset value either. As an example if you were to have a base offset of 10* and command 0* it will just fire at 10*

NO, you simply have to tune the VE table, your datalog shows the engine going full lean when you blip the throttle. if its lean add fuel [bigger numbers in the VE table].
If you are attempting to use autotune it will do nothing to adjust when you just stab the throttle over and over, its filtering that data because its a transient condition. you need to bring the rpm up slow and steady and let autotune do its job while you add or subtract fuel manually to make blanket adjustments.

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