2000 GT with 150000 miles, daily driver. I installed some new fuel injectors and spark plugs last weekend. The old injectors were stock (19 lbs./hr), and I replaced them with Accel injectors of the same rate. While accelerating, I notice a loss of power, particularly at around 3000 rpms. It feels like the car is hesitating momentarily. I did not have any misfire DTCs. However, I did get a P0171 and P0174 (Too lean in Bank 1 and Bank2) at one point. I thought that may have had to do with a vacuum leak that I may have created during the injector install because I did disconnect and reconnect a bunch of vacuum related components. I checked all of the connections. I actually replaced two hoses that may have been a little suspect and I was able to tighten the EGR tube slightly. I drove the car about 10 miles after that, and I did not see any DTCs, but the loss of power issue was still there. Any suggestions as to what to try next? I am thinking that I should reinstall the old injectors to see if the power loss still exists. During removal, a small piece of plastic broke off of one injector near the tip. I assume that one should not be reused. I could purchase one new injector from Ford, but they seem to be pricey. Any help is appreciated!