Alright so let me give you guys the story. I was driving around custom tuning my TL on the greddy e-manage system. so AFR's read between 13-15 cruising around at low rpm and when I got on the car to test the power and tune it. it was running 12-14 AFR (Not wide open throttle) so as im about to do another pull the car gets leaner then starts to bogg out and eventually I had to shut it off. so I proceeded to start the car again. It would crank and like barley run or it wouldn't at all and die out. so good news is I know my motor isn't fucked. but im dumbfounded as to what the problem could be. I replaced the stock fuel pressure regulator to see if that would do anything and shocker it didn't unless I plugged the stock harness back in. then the car would drive around at 13-14. I had flutter the gas or else it would go lean and when im at idle it would start at 11 then bogg out and die lean if I let it sit idling. I upgraded the injectors and the fuel pump but im thinking I might have a bad fuel pump now. I don't know if fouled spark plugs would make it run lean but that also might be a possibility as it was running EXTREMELY rich at first. (btw that's all on the stock ECU) on the Emanage it doesn't even want to run it just dies. so im VERY confused. maybe I blew the stock MAP sensor diaphragm from 7 pounds of boost any help would be appreciated.

 

the obvious answer is spend the money to get it dyno tuned...

 

not a lot to go on with what you have described. what's the engine setup, upgrades, major power adder?
have you checked all vacuum lines? what's fuel pressure?
when running the stock ecu, what does the long and short term fuel trim look like?