I have a 1997 Saab 900SE - Auto - Turbo. Sometimes I have an issue starting it (mainly at night, with cooler temps). But lately I've been driving down the road and the car will shut off, dash lights and everything. I can pop it in neutral, and within one to two turns of the key, the car will crank back up, I then pop it into drive and keep going. Any clue what is causing this, and what it's going to cost me to fix?