[dmbrisket 51]

sorry to hear about your problem, hear about it atleast once every 6months at work... i had the same problem when i converted, you need to go to the dealership and have them do the re-learn procedure, i got the same exact code when i swaped my 4.3 to a 5.7 and the tech at the dealer who programmed my 4.3 pcm into a 5.7pcm told me i would get a p 1345 and a possible p0300, so my guess is nothing is wrong, just needs to re-learn itselfe