I have a 04 Lightning all stock 221+ when driving wto boost runs fine when I get on it it sputtering till I get out of it I replaced fuel filter pump plugs coil packs abt 40 thousand ago I checked fuel psi 33 idle 55 full throttle it doesn't do it from the start only after 2nd I'm thinking injectors?

 

Clean the intercooler? When you did the plugs did you disconnect anything? Check all vac lines along with electrical connections. Do you have a hand held tuner and can datalog?