2002 SeaDoo GTX RFI fuel injected. Current problem is fouling plugs and service engine light coming on repeatedly.

Now for the history. 1 owner machine that was loaned out. They got a rope in the intake, sunk the ski, to the point of filling the engine with water etc etc.

Ski was tore apart and put back together. Ran good for several months.

But now it's fouling plugs and service engine light is coming on. Suspect that it's putting to much oil into the enjection. May be unrelated to sinking but wanted to share history.

Any thoughts as to culprit?

Thank in advance for my cousin.