Ok well i recently bought the car a few weeks ago, firs couple weeks was running great, the fuel pump started getting loud and it started to go lean while hitting boost. So i was figuring the pump was going. I replaced fuel pump with a brand new 255 and still doesn't work now.

I took the pump out to double check everything, then put together everything and it wouldn't want to start. It starts and doesn't idle can keep it at around 3000 rpms but when i touch throttle it pops and dies. I feel like its the map sensor but im not sure.

 

I unplug the map sensor and "runs" well reacts the same

 

so now the car runs or you still have to hold down the gas? did the car sit for a while before you went to start it?

 

it was running. just under boost over 10psi would lean out. so i stopped boosting,then around 5 psi it was doing it. and fuel pump was loud so i replaced that, and it wouldnt run only wiht gas on slightly. i unplug the map sensor and runs teh same as it plugged in. no CEL

 

check IAC and make sure your MAF is pluged in and none of the pins are bent

 

iac is working, maf is pluged in. No bent pins.

 

I ordered a map and will see if it works tomorrow after work. If not i can always return it

 

check your front o2 sensor

 

Plug in and working.

 

so no codes? 02's plugged in? MAF Sensor is ok?...do u have any way to look at 02 sensor data? evoscan or anything?

 

No codes, o2 is plugged in, maf is in and good. I do have evo scan, and i cant figure out where map sensor data is

 

Do a boost leak test and check spark plugs anyways

 

ok plugs are good, wasnt the map sensor. O2 is reading.

What about fuel pressure regulator?

if i turn my injectors to 560 it idles at 14ish afr but if i put them 1250s like they are its lean wont even idle..

 

you have 1250cc injectors?? what was it set to before?

def shouldn't be set to 1250 in ecuflash

 

Well what injectors are you running?