As far as the problem that it doesn't click off proceeding the turn, that is 100% mechanical as far as I know - something is broken on the stalk switch. And that being the case, your other problems could lie there also, especially since they seem so general - affecting the entire car. Basically, same as what BrierS said. What do you think?

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra