QUOTE(EMC 3000gt @ May 31 2008, 05:25 AM)
Changing the plugs and wires will run you about $150 your self and is a 2 hour job the first time. You will need 6 NGK plugs 6 wires 1 intake manifold gasket one throttle body gasket.
I have personally (verified thru the HHH datalogger) noticed an unacceptable amount of knock from using 87 octane fuel. (9 count)
Use 91 or better
changing the plugs only cost me about $70NZ to iridium plugs and about $30NZ for the 2 gaskets
depends where you buy them from, plus i havent done the wires tho.
did take about 2hours tho but i wasnt rushing
haaha i read the 87 octane and almost choked!!! here in NZ we got 91, 95 and 98
i always run my GTO on 98, i ran it on 91 once and it was pretty poor, id hate to experience 87!! feel sorry for you guys haah