I noticed for the first time today that I could not shut the ignition off. I turned it to the off position, but the engine kept running. I tried several times, when finally I noticed that my signal lights were on. I shut them off and the ignition operated normally..... Any ideas?

One of your turn signals or side markers has a single-filament bulb instead of a dual-filament bulb in it. That's what my car did when I replaced a bulb with the wrong thing; the power from the side marker fed back through the turn signal switch to the ignition switch, and powered the ignition which kept the FI on.

--DD

check your grounds...ALL of the engine grounds. Or something like that

b

The side markers would have single filament bulbs. That's a good one. First check your grounds, like the Gentleman said. Second I would check the wires that run up the steering column, this is a problem area for friction wear between wire's
causing a short between the two switch's. If you have a V/O meter or continuity
checker, you can sniff it out quite easily.