Morning all!!

I am new to the tuning game... but before I get started, I need to explain what is going on with my car.

so starters

upgrades include
  • cai
  • gmpp stage II kit
  • vibrant header & hi flow cat
  • magnaflow 2.5" cat back exhaust
  • 2.79" pulley
  • and.... intense racing has my pcm set for stage III


My problem is that my car is detonating constantly beyond 3/4 to full boost, as well as a lean air diagnostic code. I use nothing but premium, and have even added octane boost with no success. I have been told that my pcm is the culprit (via the Cobalt SS network) and Intense has a history of poor performance. so... I do have the HP Tuners VCM but have not yet used.

Is it a reasonable question to pose... where do I start with this pcm if it is my source of problems.

one other note... I will be installing snow performance methanol injection, but I want to get this lean air/detonation problem solved.

Any initial advice would be greatly appreciated

Regards

Shane