Trane Pressure Switch

I have a Trane furnance and I'm getting a 3 light error message. I think my pressure switch might be bad. I took the hose off the switch and blew in it and it had a hallow sound. I took the other end off and sucked on it a little and the heat came on. As soon as I quit the heat goes off. What do you think?
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I think your switch is h(a)llow and you suck!!!
;-]
Time to call out a service guy....
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