question...

[Mustang64]

Whenever i rev my engine and it reaches about 4500rpm's, it starts to sound and stutter as if it were red lining. Why is this happening?

[shibby]

What kind of car and what motor?

[Mustang64]

it's a 2002 v6 mustang....

[shibby]

Pull the plugs and see what they look like. How many miles? How long has it been doing this? does it do it every time? Do you use a name brand fuel or cheap gas? You might have a plug that is unable to burn every stroke at that rpm. Have you considered trying a fuel injector cleaner like Seafoam or Lucas fuel treatment(both available at Napa. Seafoam part number SF-16 and Lucas part number 10020)?

[Mustang64]

I use brand name gas. It's been doing this for a while now. I haven't checked the plugs cuz i haven't had time. but thanks for the imput. i'll do that as soon as i can. I also use a fuel injector cleaner. I forget what the brnad of it is though.