My 02 I35 randomly died when I was coasting one day. The TCS & the SLIP light came on. When I turned the car back on, the lights went off and everything was fine for months. The Service Engine light has been on for a long time, but that's because of a O2 sensor. This thing with the SLIP & TCS has become way more frequent since then, however. Now when I turn the car back on, the TCS & SLIP lights stay on and the car putters, not really accelerating at all. If I just ease really lightly on the gas I can revive the car momentarily, but the lights stay on. What's wrong with my car?

 

Sounds like it could possibly be a MAF Sensor.

 

I feel as though I had similar issues and mine was a coil pack on one of the cylinders going bad... Changed it and good. Just my two cents 2000 I30t w/ 140k+ miles, by the way...