just became a mrc member wot is the concquce of having 4 of same plug\'s ie with blue band!!!:Hammer
Hi
I used this as a reference when my FD3 was suffering from a stumble high up in the revs. Thought it was the turbo system playing up at first but infact it was my leading plugs fouling up. Changed back to the correct 7\'s and 9\'s and everything has been peachy since.
Definately worth the read
http://www.mazdarotaryclub.com/forums/showthread.php?t=264
There isn\'t an issue running 4 plugs of the same heat range, it\'ll be fine.