I'm having problems with my turbocharged LS, using AEM EMS for fuel management. The car has been acting funny when reving above 5k rpm's for a couple weeks, then the problem sterted getting worse. After about 30 minutes of freeway driving, the car would not want to accelerate, when I stepped on the gas the car would just bog down and stall if I took it out of gear. It stalled yesterday and I couldn't get it to start back up, hooked up my laptop and noticed very lean AFR's...I added fuel until I could get it to idle, the idle was very rough and my timing was jumping from 5 to 26 degrees.
Replaced plugs, plug wires, map sensor, what could be my problem?

 

I'm getting the ignition timing reading from my laptop hooked up to the AEM...could this be crank angle sensor, distributor?