Hi everybody! I have been posting sporadically here [and reading lots ] but now I think I will start keeping up much more. Excellent information here. My Concorde has only 172,000 kilometers so it has many good years left. But lately I have been experiencing a curious effect. After about 15-20 minutes of driving the engine will feel like it was shut off for a mere fraction of a second. No backfire, no other effects at all. It can happen anywhere from idle to highway speeds, on any road. It's very noticeable. At idle, the engine almost stalls but it will keep running. However, twice it did indeed stall but was easily started up again and ran fine. Nothing but the engine running seem affected at all. During my half hour morning commute, this will happen once or twice about half way thru. It may happen during steady cruising or hard acceleration. No codes are stored, only code 55, "end of codes". This sound familiar to anybody? ECU perhaps? Thank you all in advance.