I recently put a new transmission in and now my engine stalls when it is running for about 20 minutes. If I let it sit for about the same amount of time it will again run for about 15 minutes and the does it again. I pulled the codes and got 12,43,34,55. I've replaced the coolant sensor but the problem persists. Any advice would be greatly aprecciated. I posted the same question on another site but haven't received a reply and it has been more than a week so I'm giving this one a try.
Bob Boyce
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