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they will run on both types of coils, most likely leaking valve seats exhaust side very common, need to smoke test each cylinder with exhaust manifold off and inlet and all 4 valves closed at same time ,, ie send smoke in to spark plug holes under air pressure see what leaks out the posts, below like give a good idea how they go and why they go
more recent one i'm in middle of that had worst case ie valve seat broken up and destroyed the piston and head surfaces
 

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Thanks for getting back to me. I've orderd a compression tester which should be here tomorrow. I'll try that first
if leaking valve seats or cracked valve prob wont see it on compression test hence why pull manifolds and fill cylinder with smoke or air
 
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