f22b1 .. ok so i swapped out the stock injectors for the blue top dsm 450's. car turns on and runs like ****. won't rev past 3k sounding like i had a 2 step. turned it off. checked the fuel back pressure in the tank(removed the gas cap) and man that thing let out some serious air for like a good 5 seconds. is the accord resistor box not sufficient ?

 

also i am running a walbro255

 

All we know is that you have swapped 240cc injectors for 450cc injectors on a F22B1 with no mention of any other modifications and no information about tuning the engine. Your asking why the engine doesn't run properly. There are so many things that it could be. Using the proper ECU with a tune would be one.

Giving us a bit more information about your car and any engine build would help.