QUOTE(bretth @ Dec 6 2018, 06:42 AM)
I seem to remember something about using the wrong tail light bulb causing this problem? Unless I am confusing this with another issue, couldn't find any info on a quick search though. Something about using a single filament bulb instead of a double filament keeps the ignition circuit alive when the key is off.
That was me.
If you have the wrong bulb in one of the taillight sockets, and you leave the turn signal switch up or down (depending on where the wrong bulb is) the power from the "parking light" feature will feed back through the ignition switch to the ignition and fuel injection systems...
Mixing up power and ground will make for very very weird symptoms!
Has any electrical work been done on the car since the time it wasn't having this problem? If so, that's the first place to look.
--DD