so my gsr starts to miss after it gets ran for a while and i noticed alot of white stuff around the far right cylinder its just on the valve cover it kinda looks like it might be carbon build up. anybody have any idea why it would do that and what it is ?

 

ICM and coil can both be effected by temp, so can the PGM-FI Main Relay and fuel pump.

You need to determine if the problem is fuel or spark. 94

 

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