G35 engine #5 miss fire

[ninh1969]

Hello, I'm new to this forum. I have a 2005 G35 coupe with Stillen supercharge. The last 3 months the engine rattle every now and then. I took it in and engine #5 has a miss fired code. And because this does not happen all the time, Stillen could not find the problem. I have taken into Stillen 2 times already and left the car there for over a week each time. Any recommendation? I live in Irvine, Ca. is there is a shop that I can take to?

[joe603]

Do you have a custom tune?

[ninh1969]

I got the car from my nephew and most of his services were taken to Stillen. So, I dont know much about it.

[joe603]

Could be a coil pack about to fail...how are the plugs?

[ninh1969]

I replaced the spark and the coil on cylinder 5 and it still act up

[joe603]

man...I hate those type of issues. Need to have a pro look at it.

[ninh1969]

Stilen think it's the HKS that is causing the trouble. they are removing the HKS unit. Will see how it turn out