How old are your fuel system and ignition components?
Given the age of our cars, in my opinion, I would start by ruling out any abnormalities in the physical parts of the car first. When you know they are all up-to-date and functional, then I would proceed to other electronic methods of testing.
Your scanner may not be able to help you find popular items that cause your condition such as:
- Failing Crankshaft Position Sensor - cracked ground at the coolant temperature switch - Cracks in the ignition coil - Worn out "O" ring in some fuel pump assemblies - Clogged fuel filter - Low compression
