I just got the check engine light off by replacing the cat converter. Now, less than a week later, my 2007 LR3 HSE 189,000 miles, stalls once putting it into reverse. It starts back up immediately, but I notice the check engine light again, but I am not sure if it came on at the time of the stall.

I got it scanned and it came up with P050B, the cold start rough idle code. Basically, it will swing from 500rpm -700rpm just idling. Outside of that....nothing odd about the Rover's performance outside of that. I did just get the truck and it says my AVG. mileage is floating around 9.7-10 miles a gallon, so I am not sure if that is being affected.

Any ideas on a non dealership fix?

Thanks,
JBlais