Pulls really hard through the rpms till about 5200 until it shift it stutters/misses really bad... All the plugs are new and wires... Opti has about 18k on it... I have 2 freescan readings if that would help??? If any more info is needed let me know, I don't know what else to do

 

Have you checked your fuel pressure to make sure it's not dropping off above 5K rpm? Did you have your PCM reprogrammed to "feed" the 383?

 

I think a racetronix fuel pump is in order for it. I didnt check to see if the fuel is dropping off but both 02 readings are 0.95 when at 100% ... I will call PCM4LESS tonight and see if he could up the pressure... thanks OBE1... anyone else??

 

told u it could be the fuel pump :P

 

Hey thanks for the help bud lol

PS - I still got your front Hals and DMS springs