I have one other idea - you may have both a misaligned distributor and an incorrect Spark Output setting, resulting in your coil charging on the wrong half of the cycle, but the spark firing at about the correct place due to the disti rotation.
To check this, try:
- plug in the battery charger, you may be cranking with injectors unplugged for a while
- by hand, rotate the engine clockwise to TDC
- pop off the disti cap and see if the end of the rotor is roughly over the scribe mark on the edge of the disti housing. If it's off by half a rotation, crank the engine around to the next TDC. If it's within adjustment slot range, rotate the disti to align the scribe mark. You will probably need to remove the disti and move it by a gear tooth. If it's already aligned OK, stop and report back. (If you have a copy, see the Bentley manual for alignment pics)
- once the end of the rotor is roughly over the scribe mark, put the cap back on and unplug the center lead from the cap. Fixture it ~1/4" from a solid chunk of metal (a magnet and a single plug wire holder work great)
- in Tuner Studio, setup for SparkMode:TriggerReturn, TriggerAngle:60deg, IgnitionCapture:RisingEdge, SparkOutput:GoingLow, FixedTiming, TimingForFixedAdvance:12deg, CrankingDwell:5, CrankingAdvance:12deg, NominalDwell:3.5 (The 12deg is the factory timing spec for LH2.2)
- unplug the injectors
- go to the TunerStudio CAN/Diags:OutputTestMode Inj/Spk screen. Enable Test mode. Enable Fuel Pump if the fuel pump relay provides power to the coil. Try coil testing One_coil/CoilA/3.5ms dwell. You should be able to see the sparks. Check that the ignition module and coil are not getting hot, or else the SparkOutput:GoingLow setting is wrong and you should stop here.
- OK so far? If so, get out of the test mode, plug the coil wire back into the distributor, and crank the engine (injectors still unplugged). Use the timing light and rotate the distributor to get to 12deg advance while cranking. Unless you removed it, there's a test terminal near the top center of the bulkhead that can be jumpered to +12v to crank the engine from the engine compartment.
- OK? Timing during cranking now 12deg?
- Plug the injectors back in and hopefully start the engine. How's it run? What's the timing light say? You'll probably need to use the timing wizard to adjust the 60deg TriggerAngle up or down to get to 12deg fixed timing. Finally, try reving the engine and see if timing stays fixed.
Sorry for the rambling instructions, I'm never sure of the talent level, and future readers, here.