This is going to be a heck of a first post but here goes. I recently rebuilt the engine in my 03 cobra, I went with MMR 18cc pistons but otherwise stock internals. From day 1 it ran ok, didn't make as much power as it used to, as soon as it get hot (normal operating temp) it started to lose power. If you press the accelerator enough to get the boost up, it falls on it's face. I found a small vacuum leak and repaired it, no change. while it was apart I stock piled fun parts jlt cai, sct 2600maf, accufab tb and plenum, ford 60lb injectors, 2.81 sc pulley and kennebell boost a pump, an sct x4 tuner pre tuned for these mods and recently installed them hoping the tune would fix the issue. No luck. It finally threw a code the other day P0174 bank 2 lean. I replaced all the coils also when this started. Now I loaded the x4 tune on the pcm and was trying to datalog to get more info when the x4 bricked on me (not a huge fan of sct at this moment) So the brand spanking new x4 is back at sct for an unknown amount of time getting repaired. I do have an actron scanner that can datalog some pids. I am at loss as to where or what to check next. thanks for reading my wall of text!