I have a 1995 Mazda MX-6 - 140,000 miles, 6 cyl auto trans. When I am on the interstate, if I take the car up to around 75-80 MPH, the engine light will come on. Once I back down to say, 70-75, after about 1 minute the engine light will go off. If I accelerate hard enough (at any speed) that kicks the trans into a lower gear (say passing someone at 50 MPH), the engine light will come on for 1 minute or two then go off. Even if I take off from a stop light or stop sign on the fast side (I'm not talking about rodding it or racing) I have to be careful to not accelerate too fast or the light will come on. I dont know if I'm ruining anything - the motor looks and sounds fine, no knocks or anything. It's had regular maintenance, and for the most part drives very smooth. Thank you in advance for any help!