No starting problems or stalling. I have tried running without the filler cap and noted no differences. I haven't been able to find the "end" of the vent line. However, I am beginning to think it is not the problem.

I just read an interesting article in MBZ.org about ALDA ADJUSTMENT. There is mention of the alda leaking, due to a large o-ring inside failing to seal. A great article showing the alda taken apart. It appears to be pretty straight forward.

With this in mind, I will be checking that tomorrow.