I've got a 2007 with a roush charger on it. Overall I love the truck, but I bought it used and have a few questions.

1. It sounds when I'm accelerating like a hydraulic pump cavitating until the boost kicks in. Also, the boost sometimes seems to hesitate kicking in.

2. Occasionally, usually when it is cold still, it seems to hesitate and have a hard time accelerating. Usually from a stop sign. This only seems to happen once in a while, afterward, it performs great. Also, there are a few instances when my boost gauge will not read any boost. The gauge is not a roush gauge and doesn't show vacuum, it is either at 0, or goes up to about 8 psi, (normal boost I think) If I shut the truck off and restart, it works properly again.

3. Lastly, the A/F gauge always shows rich, never ever moves to lean, or moves from the furthest light indicating rich.

I have posted this in the supercharger forum and had some good responses, but would like to post it in here too and see if anyone else has and suggestions.
Any information or pointers would be appreciated. Thanks