I just moved to sac from ct. Noticed some sort of putter when I accelerate harder. Noticed it in denver passing a rig at high altitude. Thought it was the intake struggling with thinner air, but it has happened a couple more times after that. I'm unitronic stg 2 and I'm due for an oil change. Anyone have a problem like this? I read it might be the coils or something? I'm a newbie so I'm pretty lost. Don't wanna bring it to a mechanic yet.