I had a few episodes with rough idling and stalling/CEL's 2 weeks ago. The Consult II scan indicated a fuel leak warning. The Nissan technician, however, suspected waterlogged fuel filters (Caribbean models have two fuel filters), on the basis of a few other experiences he had previously. This indeed turned out to be the culprit. (Although the fuel moisture warning light did not flash.)
You may want have this sorted or ruled out first before going forward with the possible timing chain issue.
You may want have this sorted or ruled out first before going forward with the possible timing chain issue.