BossDJ

Hey guys, hopefully some of you guys can help me out.
I have a 2003 350z performance 6 speed and i changed out my spark plugs. It has 113000 miles on it now and i decided to change it out because im not sure the last owner changed them at all. Non of the maintenance receipts show it. Anyways, i put in the NGK LFR5AIX11-4469 oem laser iridiums and after the car idle shakes the car a bit and sounds like a subaru sti with exhaust at idle. And when I test drove it it would pop.I unplugged the battery and also installed my 5/16 motordyne plenum spacer basic version at the same time and torqued them using a in/lbs torque wrench. I also had to unplug the throttle body sensor and other ruubber hoses to remove the plenum during install of spacer. Plugged everything back in and there seems to be no leak anywhere. Checked the coils too amd they are on there amd sensors in appropriate coils. I also hand tightened my spark plugs before using the wremch. It also threw one cel light p0300 (which i know is a misfire) And after 20 mins of starting up the car again the cel light is gone but the idle and sound remains the same. Can anyone help? This is my only car I have to drive.

sportbiketed

iTrader: (11)

Two of your coil pack wires are switch, most likely on the drivers side.

BossDJ

Thanks and you are 100% correct. I switched coils 4 and 6 . Thanks again for the help. Car runs normal again

CK_32

iTrader: (1)

Might not be related or an issue yet but did you space/gap them before installing?

Common thing missed when people replace plugs.