i understand that much about tuning i used to tune motorcycles on a dyno, but what this guy is saying is that when you load the engine up at full throttle going uphill etc you know that spot that you keep adding throttle but all you do is bog? kind of like your are running out of fuel for the amount of air going in? (i suspected a lean spot as i feel this all the time in the hills and bridges around here in 5th gear. go up a fairly steep bridge doing 65 and lose speed down to 50 at the top of the bridge, more throttle doesnt do crap...my truck has an open air filter with the air horn removed btw) he is saying it actually started pulling uphill beyond this point after changing injectors, id like to kno if there is any truth to that. almost like with air filter modifications and the air horn removed (dildo shaped thing, look inside of it and it actually chokes airflow 60 percent from what i seen) you get the air you need just not the fuel. i noticed whenever i had the airhorn installed on the truck i could go full throttle and have power the whole way. remove it and beyond 70 percent throttle you have power in the lower gears just seems when you get to a certain point you are out of power with more pedal. 5th gear you can cruise all day long but you hav a hill or something you better find 4th or your speed will nosedive, i hate this about my truck and i kno there is more power to be had, i hav 215/70r14s and 3.73 gears this shouldnt be an issue. to me it just seems like ford programmed the ecu for very little air and without good resources to tune my obd1 engine (92 ranger) im stuck with little options. if something that simple can be done to correct my little issue without touching the computer i would be ecstatic. almost willing to give it a try just to see what the results would be and report back to you, but its really cold and im trying to save money for a new motor (mine is smokin a lil and going to build for more power). tuning wise i understand by increasing the size of the injector you are simply increasing the threshhold for more power, it has to be programmed in. now with that said, and the aforementioned statement that in closed loop it will trim it off. i understand this, but you are only in closed loop at idle and cruise, you dump the throttle 10 degrees either way for accel or decel the truck goes into open loop and reads the programming and adjusts the fuel level per the throttle position/cfm (mass airflow sensor) and rpm, its still sending the same injector pulsewidth from the initial programming to the injectors based on that map. if the fuel pressure is the same and the injector size is larger, would this not in theory richen the mixture during open loop accel/decel, where im looking for performance in hillclimbing etc? and since we are not talking going from 14 to 35 lb injectors, just a slight increase to a maximum of 17lbs, we wouldnt be just dumping fuel in the motor, normally id just try to get an adjustable fuel rail and bump the pressure up across the board but dont want to put too much pressure on the injector and cause injector misfiring/sticking.