OK so my f150 has the 302 with fuel injection and the 4 speed manual. it idles fine and you can rev it up fine when its out gear. the problem starts when you try to give it gas when its in gear it try to bog down and will some times backfire. if your slow and steady with your acceleration it seams to do fine but you really cant make it go faster then 45-55 mph and the fuel mileage is horrible. it seams to be worse after fueling up so i thought it might be the fuel filter and i replaced that it is doing better but not much. any suggestions would be helpful thank you in advance for your time.