E-3 COOP Not hitting

I have a E3 Coop that was running OK, but now it is only hitting on about 2 cylinders. I have checked all the plugs and they seem to look fine. I also have a spark tester, and there is spark going to each plug. Any theories as to why it isn't hitting like it should?
 
If the spark is strong and you?re certain it?s not fuel related, check compression. If compression is ok, check the valve springs. You could also look for a manifold leak, either external or a hidden leak between the intake and exhaust sections.
 
If it's missing on two cylinders, make sure two spark plug wires have not been swapped. 1-3-4-2 is the firing order - (clockwise on the distributor as I recall). Other than that, the head gasket may be allowing low or no compression between two cylinders.
 

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