Check your engine wiring harness and make sure the insulation has not deteriated to the point wires are shorting against one another in the wiring loom. A simple area to inspect the insulation is at the temp sensors near the front of the engine.
Tell me about it. Mine started that 2 weeks after I bought it. (Only 80,000 miles on it) I don't know how he got it to "suppress' because I really drove it fast during my "test drive." Got so sick of seeing that ASR light and loss of power. Everyone looks at you as you limp over to the side of the road. It's a $4,000 fix.