SJ, he stated eariler in this topic that this was done.
Riv, look at my old pics in my 'holy exhaust cracks batman' topic. You'll see just how difficult it is to find those cracks. But for the time being, try to find any exhaust/EGR leaks and check that fuel pressure first, rather than pull your EM'* again for now.
Check your fuel pressure:
1. Key on for 2 seconds (no start), repeat 2 more times (prime for 2 seconds, 3 times). What'* the pressure?
2. Start and idle. What'* the pressure?
3. At idle, pull the vac line off the FPR. What'* the pressure (no, this is not as accurate as WOT under load, but it can give an indication of a problem under those conditions).