1997 evinrude 70 choke problem

[Elford25]

I have a 97 evinrude and the choke isn't working right. It sounds like it wants to kick in buy its not clicking like it was a week ago. There is what appears to be a place to put air to it with a red knob on it and if you turn it it gets weaker I was wondering if that had something to do with it

[boats.net]

No the red knob is manual choke, test to see if getting voltage to choke