No O2's
 

Ok heres what happened!!! When i installed the motor i didnt have the correct injectors in it and it was lean bad. So i got the right ones and a retune and it ran fine for a while, then started acting funny starting up and then got to where it didnt run right until you floored it. So i called up at F.A.S.T. and talked to Tony, he told me to unplug them and see if it got better so i did and it did. Well since it was running better i have never put any back in it. My question is: Is running without O2's hurting the performance of my motor? And which ones do i need to get?