170K miles on the car. Intermittently the car will simply shut off. Sometimes when driving and sometimes when idling in park. Sometimes when I start it, it acts like it is only running on a few cylinders and will die if I take my foot off the accelerator. Normally the car performs great with no problems at all. But when it starts to do this problem, it will persist for approximately 50 to 75 miles of operation, then all of a sudden it will be fine again. Also failed inspection this year for poor air flow through the engine and unburned fuel in the exaust. Air filter is new.
I had this problem once with a Jeep Wagoneer Limited. The combustion principle is most simple. You have fuel and you have spark. Since you are getting emission failures because of unburned fuel, I would start with the spark.
Most modern cars don't use points anylonger, but an electronic computer circuit to generate the spark. These can be very temperature sensitive. In my case, whenever the car would get warm, it quite and left me stranded, 20 minutes later, it would cool enough and run again as if nothing had happened.
I would try locating the spark amplifier under the hood and get a replacement. This is likely to solve the problem.
Hope this has helped.
Regards,
Doug
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