While I have heard of the lining in the composite valley gaskets coming off I have not heard it clogging the oil pickup.  If it did the oil pressure light will come on and stay on.
I just use the older straight tin gaskets and have no issues though holes on all type of gaskets require modification to fit - is a horrible system.  I guess the composite gaskets were introduced to lower engine noise levels because there is no other reason to fit them.
The OP has an ignition problem so coils, leads, and plugs need to be looked at first.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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