Ok im new to the evo seen and i just bought this 03 evo and when i throttle it it begins to sputter and back fire but when i just run it normal all the way to redline it doesn't the dyno place i wrnt to said it was the coil packs but im not quiet sure can someone help me out here thnx.

 

I think it is coil pack too...I had almost same thing happen to me too...I upgraded to coil over system I got a couple coil packs laying around...I can sell them really cheap if interested...I can do $30 each shipped or $50 for both shipped