2001 saab 93 se starting and turbo problems?

3 times in last 2 weeks, 2001 saab 93 se cranked over normally, but would not start. However, i was able to "pop start" each time by rolling down a hill. Wierd because the starter etc seemed to be crank normally. For 8 mos. the check engine lite has been coming on now and then, so i plugged in Code Check computer device and it showed code p0107. Code Check site said something like fuel/air mix too lean. Also now the car on heavy acceleration, misses and the turbo has long lag and will only move the turbo gauge about a 1/4 to 1/3. Also is a slight change in idle rpms from about 950 to 1100 every 10 secs or so, accompanied by a slight rattling noise increase, audible only with the hood open near the front penger side of the engine. Cause i use 87 octane and run the tank to very near E (Wed,100 m into 400 m trip i ran out) today i put in octane booster and a fuel additive to dry out water.May help? Also,had new throttle body, 10/09. Your diagnosis? Please.