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Not firing on all 6 cylinders!!

About a year an a half ago I blew a head gasket so I had the engine removed and the head gaskets both changed, The car fired up straight away but was not firing on one of the back cylinders (now this is the confusing part) there is fuel getting through and there is a spark I have also done a compression test and that too is fine, The only thing i can think of now is that one of the valves is sticking........ Could this be a possibility??

The other thing is that the oil pressure is quite low (cant remember the reading but i have checked it with a separate gauge to eliminate a faulty sensor)

 

Any help would be greatly appreciated guys,

 

Thanks

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    Its the passenger side rear cylinder that is not firing all the coil lead are correct and all the other cylinders are firing as they should

     

    Cheers

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