2010 Ford F-150 STX 4.6 purge valve solenoid?

I notice it's time to change my purge valve solenoid when the car shuts off when stopping. No engine light comes on. I change the selonoid and it runs again for about 15k miles and it goes bad again. Do I need to change the big canister (charcoal) related to this valve selonoid? Will that fix it or what do... show more I notice it's time to change my purge valve solenoid when the car shuts off when stopping. No engine light comes on. I change the selonoid and it runs again for about 15k miles and it goes bad again.

Do I need to change the big canister (charcoal) related to this valve selonoid? Will that fix it or what do you suggest. Many thanks
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