Intermittent is a word mechanics dread. You have several possibilities for the problem. Moneypit pointed out how to check one of them. Three other possibilities come to mind: failing fuel pumps, failing over voltage protection relay, or failing EZL unit. I've seen them all. Next time it craps out, you can unplug the ECU just to get down to basic CIS. The car will run without the ECU. Good luck.

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