Ever since the last time I had my car tuned, my car has been running like crap. If I cruise any where under 2000rpm, my car stutters as if it needs more fuel. If I get on it, it first hesitates then takes off. I asked the shop that tuned my car and they responded by saying it was because my car had cams (comp 270xe). They are also the shop that built my motor. They said if I cruise below 2k rpm, I'm lugging my motor. I believe to a certain extent but recently my car started to run lean and was stuttering/hesitating at any rpm and speed. I also have a svt focus pump and the stock 19lb injectors. I have a 01 GT. Does anyone know what the problem could be? Should I upgrade injectors and get it retuned? Thanks in advanced.