If it isn't the ignition switch it could possibly be the TIPM Box under the hood. I have a 2008 Cruiser and my horn would come on when it wanted to. Plus the car would act like it wasn't getting fuel and would eventually die. I would get out pop the hood and tap and shake the box and the car would drive on normally, but eventually it got to the point that it would only drive for a couple of minutes. So I purchased a remanufactured TIPM Box from MAK'S installed it problem solved.
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