Saab: 89 Saab 900 turbo, spg start trouble, variable dc power supply, dc power supply

Question
Starts fine when cold or hot.
Problem occurs when car is run for less than 15- 20 minutes on cool days
and then turned off.  Re-start is difficult.  Car acts like it is flooded- 15
minutes of sitting off- and it starts fine.

Oh yeah- it matters if the car is parked flat or nose down.

O2 sensor?
Fuel injector?
AIC?  (Idle is also intermittently sticky.)

Answer
Michael:
 Inasmuch as I am out of the US now, I cannot go into much depth; however I would start with the aic; they become 'sticky' with age and use. It consists of a rotary valve that can easily be cleaned using carb cleaner as a spray and then followed by a lube such as WD-40. If you have a variable dc power supply, apply 0-8 volts to check the action...with the valve rotating freely. The midpoint is approximately at 7 volts.
  I hope this helps.