well the new motor is in and running good but i gave it a good shot today and at around 4000rpm and up its breaking up so i swaped the coil no change ckeked timing base timing is at 12 ?????really anoying considering its a brand new motor ?had the same prob last year but coil fixed it ??could it be the pick up coil ???are they a bitch to change ?also i have 24lb injectors with calabrated mass air , BUT STOCK HEADS could this be my prob to much fuel it runs great just not in high rpm???what to test ??guys