Having an issue with my BF ute. The ute had a 3.5" exhaust, cooler, 60lb dekas, walbro pump and a custom tune. All the parts were pulled off and it was returned to standard. After a while everything was put back on (long story) and the tune loaded back into it. It was fine for a day or 2, and then it threw a code. P0172 - system too rich. Thought it might have been a one off so cleared the code. Now it happens randomly. It seems to happen as I am slowing down to come to a stop but it doesn't do it everytime I drive it. I loaded the other tune and still same issue. Any ideas what could be causing it to run rich and throw this code?