Nissan Repair: 02 Frontier SC rough idle, vacuum leak, frontier

Question
Hi Calvin,
I have an 02 Supercharged Frontier, 66,000 miles origonal owner, well taken care of. rough at idlingand about 10% down on mpg ???? drives fine, spercharger kicks in well, truck drives fantastic but when I come up to the light it runs rough, auto trans. I took it to the dealer and everything check out , no issues came up. I was told that supercharges do this,  can you help ? it never did this before

Answer
Hi Gary -

Are you saying there are no service codes?

I would first check for a vacuum leak. Get some carb cleaner and lightly spray over the engine while idling rough. If the idling improves, note where you just sprayed and you should be near the source of the leak.

Have you disconnected the turbo and noted how it runs?

let me know
aloha
calvin