Even if driven very little and hardly ever needs fuel- That's perfect recipe for Water. But I still say you are developing intake issue that the computer compenates for most of the time. I had to redo mine twice before I got it right. I replaced all my spark plugs coils 1st. Then did the intake. There is a lot of vacuum lines too. I finally have mine driving beautifully!

1990 Black Monty LS Over 300K' 1993 Isuzu Rodeo LS 4x4 46k (yes only 46K!)1989 Honda Transalp 600 Africa twin,