1991 4Runner misfire, cannot figure out

[SonicCougar99]

I'm coming to you guys to see if anyone can help us out. A buddy has a 1991 Toyota 4Runner with the 3.0 V6 that has a consistent misfire on #6 cylinder. We have swapped injectors with another cylinder, and it stays at #6. We have good spark (will jump an inch gap to the fender), and we have good compression (90 lbs of compression). We cannot figure this out. My buddy with the Toyota and another friend have worked on countless 4Runners and are stumped by this one. Anyone have any expertise on 4Runners that might be able to help us out? Thanks.

 

[Outlander560]

-how does the spark plug look?
-Is it wet with fuel? Is it discolored?
-90psi is that running or no start crank compression? 4 strokes?
-What is the compression on the companion cylinder?
-Distrubutor I'm assuming wonder even though you have a spark it might not be strong enough how do the contacts on the cap terminals look?

 

[Shorty]

throw a noid light on the #6 injector and see if the circuit is good and if there is a steady on/off signal from the ECU.