On the 90 we just got I just pulled the plugs thinking they were oil fouled on the one cylinder due to a bad valve guide but it turnes out by the looks of it they are fuel fouled. Inside the TBI looks like it is dumping to much fuel in. Any ideas on what to do? Should I get another TBI or rebuild the one I got? The plug I thought would be oil fouled has some oil on it but not enough to foul it.