The 6 'somethings' in the center of the cam cover are the ignition coil packs. IIRC the injectors are either in the intake itself, or covered by it (don't recall which side of the gasket they're on).
I wouldn't expect the injectors to be the issue, because, if it was the seal between the injector and the fuel 'rail' it would spray fuel all the time (vehicle would have likely burned to the ground by now, no I'm not kidding). If it's the seal between the injector and the intake port, that will give you a vacuum leak with the associated rough idle (because it's not getting the same ammount of air to each cylinder, and is unlikely to be a consitant leak).
If you hvae a 'gas smell' when you park in an enclosed area, the first thing to chech is the gasket on the gas cap. With the high 'oxy' content of the modern fuels it eats those alive.
If that's good (not cracked or rock hard) check the tank unit retaining nut. IIRC the tank unit in these is held in by a large (6-8 inch) plastic retaining 'gland' (nut). If that comes loose it will give you that smell. If it comes just a little looser, it will give you the same rough idle the injector to port seal leak will (just a touch looser still and it will give you an error code, something to the effect the 'tank pressure' is wrong).
If that's not loose, check the filler neck hose and all the connections to the charcoal canister (I think that's on the crosmember immediately forward of the gas tank, but I'm not 100% sure on the '03s).
Not that you can tell I've been scoping these out to grab one at a salvage auction.