P0442 code, Performance degraded on 2005 Ford Crown Victoria

I am seeing loss in power. Does not accelerate the way it was.

Asked by for the 2005 Ford Crown Victoria
You need a computer scan and system performance test to prove out P0442. Can many different things causing it. If you want us to check this out please call 313-562-7022 or schedule an appointment on line at I am sure we can diagnose it and give you the answer you need.
I have this car in the shop right now. They said there is no other issues with the EVAP line. It was the gas cap. Engine is in good health. I am going to drive it and see if the performance issue has been resolved.

Thank you for your reply.

I was looking for steps that can prevent me from spending tremendous amount of money and time. The above could have been a $15 fix.
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