Recently I have noticed that there is a very slight engine stutter when I am in drive and stopped. I can tell my the lights slightly dimming every so often. Unsure what it could be, dont even know if this is normal. It is an 05 mustang V6 with about 16k miles on it. Only mod I have is a Cold Air Intake.

 

it should still be under warranty so you should take it to teh dealer and let them figure it out