Started truck this morning and it sounded like a cummings. low power no smoke. no previeous problems. hooked up hypertech and showed the following codes.
P0202 -ECM fuel injector 2 controle circut

P1621- controle module long term memory performance

P2149- injector positive voltage relay control circut group 2

B0229- hvac control module recirculate position feedback circut range/performance

After clearing codes and tuning back to stock, truck started and runs fine.
Any ideas on what might be wrong?

The connector on #2... Time for the ice pick trick...

X2, i'd say ice pick the #2 (driver front) and #7 (passenger rear).

What does the ice pick do?

Do a search for ice pick and it will tell all. Or click on this:

http://www.dieselplace.com/forum/showthread.php?t=142114

thanks for the info working so far i will keep my fingers crossed.

do the LBZs have this problem?

Sounds like the harness at the passenger side of the alternator-- cut the zip tie and inspect the under side of the harness-- the sharp corner of the FICM bracket cuts into the wires. Repair and insulate with a short piece of heater hose. :)