Ok so I took a road trip (about a 2 hour drive) and for 1 of those 2 hours the car ran great, until I tried to pass a truck, downshifted, gave it some gas and it started sputtering like crazy, and leaned all the way out on my AEM AFR. It then only allowed me to get to-4-0 psi without leaning out completely.
Today it was even worse, Normal highway cruising would put my AFR at 16-17... I would literally have to feather the trottle to get ~15.
Also, if I'm cruising, and I get off and back on the throttle it leans all the way out for a second, then corrects itself. My idle sits at 14.8-15.2, which is pretty normal.
I'm scared to drive the car, no idea what it can be.
Maybe MAF?

mods are FP black, ID 1000cc injectors, DW fuel pump, and all other bolt ons....
Spark plugs are new.
CEL is on, but haven't been able to read it yet.

Please help! thanks.

 

Also, the car has a hard start when warm...

 

Damn bro...misfire maybe? That code will allow more help

 

Definitely need to know what the CEL is. How's the car idling?

 

Maybe it's your tune JK sound like it's your fuel pump relay?

 

fuel relay was replaced about 3k miles ago along with the turbo and everything else.

 

I'll ask the obvious is your little hose zip tied? If you don't know what hose I'm talking about, then I think we found your problem

 

Do you still have the OEM fuel pressure regulator? Mine failed after installing higher flowing pump so that it wasn't adjusting the fuel pressure with boost, but I didn't get any CEL. As others have said, best place to start is with reading the CEL.

 

Mine starting acting crazy recently too. After E85. Sometimes it won't want to drive past 2k RPMS and when the car is already warm, it's hard to start up. This month it's getting the new Walbro for E85 with the harness and a SpoolinUp COP. I hope it fixes something. When you fix your problem please let me know because our cars have similar symptoms. Thanks

 

it's not zip tied, but it didn't pop out and my idle is fine.

I'll check out the cel today.. don't even wanna drive this thing with how lean it's running =[

 

So i just tried to drive it to my shop, I got up the block car never went below 17 AFR, turned it off and called AAA... this should be fun.

 

This. Check both ends.

 

Check fpr hose, coolant temp sensor, maf, fuel filter and injectors (sometimes they clog if you are running e85)

 

NYC has no e85

 

Solution : seems that after 7300 miles the filter off the fuel pump clogged up. My shop did a pressure test and i was only getting 10lbs of pressure! Filter was replaced and the car's good as new.