[obzidian]

Tax is right when he saying that there could be a problem you should be paranoid for.

The right hand side of the AFR gauge is Lean condition, which is BAD, umm-kay!! Strangely, your stating that you only exerience it with the motor on no or very little load, of at vacuum. If the gauge isn't faulty, which i can only assume since your rigs check engine light went of as well, then you have a serious probably. Your not getting enough fuel versus air into the engine. Furthermore, your saying that when you start moving, your fine.....

Ok, the first thing i would do is call the shop who did the install and explain to them the problem. Also, I would mention that the rig is not driveable, TO YOU, and that they would need to either send someone or send a tow rig to get the truck to their place. Secondly, I would start with the simple stuff.

* Scan the engine and check codes, if any.THEN, scan for a misfire code on any or ALL cylinders. Scan while, very quickly though, you see the AFR gauge pegged on lean and while it is not. (Gotta be careful here)
* Check your injector harness connections for a faulty connection.
* Check the MAIN fuel injector harness for a faulty connection as well.
* Remove injectors and check for any debri (quite difficult but worth it.).
* Check, if any, new installed fuel lines, grounds, rails, -an fittings, etc.
* Im not sure exactly what the internalreg is on a 6.0L, but check for fuel pressure at the rails and it should read at 60psi, or closely around that.
* Also, check your o2 sensors just for safe keeping.
* Check spark plugs for any signs of lean conditions.
* Any silly wiring or grounds that aren't grounded correctly, stupid stuff like that has blown a SH!T load of motors before, so dont think its stupid.

Two things: What tune do you have in the rig right now and what did you do for the added fuel requirement with the supercharger? First, i ask because if its the stock tune, then i would check it and make a claim to manuson if things go wrong and you cannot find any other reason why your exhibting a lean condition (more air than fuel past 14.7 afr ) at idle through mechanical issues. Secondly, if someone else tuned it, then please check to see what he may have done with your fuel trims in your non-WOT tables. That person will have to answer to any problems with your rig.

This is something quite serious so becareful. A lean condition will REALLY ruin your day!! Its not the superchargers fault, there is something in the system that is not feeding enough fuel, of it isn't getting to a cylinder(s) correctly, or your engine parameters are reading correctly and thinks theres a lean condition when there is non. Hey, did you change the MAF with the install? Also, is the AFR gauge is wideband or narroband gauge.?

You might just a condition where the engine thinks its getting more air than it really is and trimming some of the fuel at idle. HMM... does that blower have an internal bypass or internal blowoff valve? If so, it COULD be stuck shut and dumping more air at idle than normally expected at idle. Also, you might have an air leak and getting more air in at idle, though i doubt that if your engine can even hold idle in the first place.There are SO MANY THINGS that could be wrong, ya'll just gotta find the right one. Don't worry, it'll get fixed!!

Here's another one, im assuming it didn't do it as soon as you left the shop, so it was something that happened with time? These motor go through a learning stage that recalibrates its timing/spark/fuel trims accordingly. How many miles you think you traveled before you noticed the lean condition? You can try a "tune-reset", drive around for about and hour and see if it does it again. However, this would be the last thing i would do if you have tried just about everything else.

good luck bra!!!