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Having computer issues - misfiring, rough idle, then it stops and all is fine. on 2011 Dodge Grand Caravan

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A recall was issued to deal with the PCM software, which I had updated. Fine for a couple of weeks, then same thing. At the time, OBDII codes issued were P0172 and P0175, fuel banks 1 and 2 running too rich (respectively.)

When it doesn't "self correct" after a few miles, I pull over, turn off the engine, wait 30 seconds and restart. Usually (95%) works fine after this, from 2 days to 6 weeks. Van was perfect up until 60,000 miles, I now have 70,000. Anyone have a cure for that?
Thanks for your help.
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Thanks, but I'm in Vancouver BC. Chrysler Canada only covers for 100,000km (60,000miles) as opposed to 100,000 miles in the US, so I'm out of luck there!
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