E9 missing on #8

[KevinD]

Hi 

I have a 1988 superliner with an e9 500 that suddenly developed a miss on #8 and it's pushing fuel out the exhaust. I have been struggling with it for a while now.

Injector was tested and it's fine.      Cylinder head was changed out with a good used head thinking it was a valve seat or valve problem but no dice the last thing I tried was haveing the fuel pump checked out it tested good 

I'm at a loss and must be missing something? Any ideas where to go from here

thanks Kevin

 

[HeavyGunner]

Did you check compression in that cylinder? I'm far from a mechanic so take that into consideration but if you have fuel and air the last thing that is missing is ignition (compression). 

[KevinD]

I've done a compression check and all cylinders are 475-500 psi