97 nissan pickup, idles rough charcoal in purge

It is the knock sensor. But before you do anything first check the vacuum line which is on the front right tire on the rear side of the tire where small hose from charcoal canister up over the shock to the purge valve. That vacuum hose from the purge valve connected to a metal hose and then the metal hose connected back to a rubber hose on the purge valve. that metal hose because it gets rusted cause a leak causing Injector 2 to missfire.

I would start with the IAC (Idle Air Control) valve. The IAC valve usually, USUALLY, trips the Check Engine Light, but, sometimes may not.

Aside from that, it could be other issues: spark plugs, ignition wires, distributor components/assembly, etc.

BTW, is the Check Engine Light on?

Hi, all vapour cannisters are of the same design. Fumes are drawn through a charcoal medium "and cleaned"plus the fumes condensate is absorbed by the treated charcoal The major differences in designs cover the physical size of the cannister and the layout of the fittings. In theory it is possible to fit any cannister to any vehicle using modifications to the cannister body / shell.

Hope this helps.

check for inlet manifold vacuum leak, spray some lube like RP7 into that area and you may find the engine will run rough, thats the problem

Your EVAP system is not working properly.
It is defidently something that you will not be able to fix yourself because of the tools that are needed. What you can do though is lift up the hood and look for a green cap. Follow the hoses that come from that cap and see if you find something wrong like cracks, tears, or something not connected. And make sure your gas cap is on tighly. If you spot nothing wrong, then you will have to take it to an actual mechanic

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Nissan Maxima Factory Service Repair Manual 1994 2009

follow the given link,it may be useful for you 1997 Nissan Pickup Service Repair Manual

you may have a carbon buildup problem in the egr system, i would check this and the hoses for leaks first

Hello,
The Evap Purge Solenoid sometimes can be found by following the hose from the canister but sometimes the line runs into a block of line which make it difficult to follow. Here is a site which provides diagnostic help with pictures.The also have the parts available for purchase at a very low price along with many more hard to find emission related parts. www.qualityresale.net

the idler valve this controls the air into the system, looks like this.
remove and clean out using carb cleaner or solvent based cleaner that won't damage ruber.