The 93 knocks when lightly taking off, the #6 inj is covered in black sooty/oily crap, the little rubber washer that keeps water from going down in the inj bore is gone, and while going down the road she likes to spit sparks from under the hood. Started yesterday night, haven't been able to check it out yet. Any ideas on where to start? The antifreeze level is alittle lower, oil looks fine, and all gauges were in check. When I popped the hood before I shut her off nothing was cheery red or looked hot. What do you think?