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this sounds like the charcoal cannister that the tank fumes vent through may be choked up
they don't last forever and need to be replaced every 100K miles
the cannister is located behind rear passenger side inner wheel well next to the filler neck. It actually runs directly above the inner fender well at the highest point in the opening.1. First -jack up the rear of the car and place on jack stands.2. remove passenger side rear tire.3. Next you will see several plastic screws some are screw in push pins plastic style. Along with 2 nuts, 10mm and then several smaller I think 6mm bolts that hold the inner fender well in place. Unbolt all of these.4. There is also a plastic housing that hold 2 wires open this up and unplug the 2 wires5. then pry out the plastic holder from inner wheel well, and then simply pull out the inner fender or just move it out of the way.6 you should see the cannister connected to another large blk part. There are 2 silver screws , unbolt these 2 screws and it should be freed up and able to be lowered to unclamp hoses7. There are 3 hoses connected. The 1st us actually on the other side of the cannister and the other end has 2 as seen in the pix. The solo hose you have to lift the clamp and then can slide the hose off.8. There are still 2 more hoses they are clipped in. The larger has a ring you have to squeeze and raise up, and the smaller one has2 buttons you push and pull it off.
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