: Help !

09-10-11, 06:06 AM
My modified 2009 cts-v (620-630 rear wheel HP) has developed a miss slowley over the last 4 months, it's very spicific, I only notice it between 2,400- 2,800 rmp with ~50% pedel. My speed shop is at a loss as is my Cad. dealer.
Any comments appriciated.

09-10-11, 08:38 AM
Check Plugs, clean Maf,
Could it be the gas? Have you tried getting some fuel elswhere (make sure it is top tier gas)
You should run a scan on the injectors and coil packs.

I can't believe the dealership cannot determine the cause. Is it in warranty period?

09-10-11, 09:22 AM
I think it might be in the tune. Not enough fuel.