1923 roaster starting problem

[kwisor]

hello
my 23 has just started to act up for the last 10 years it has always started up fine but now the only way it will start is I have to use starting fluid and then it starts and runs fine till it sits a couple of days any ideas on what to look at
thank you
kevin wisor
1923 model t roadster p/u
1930 model a tudor