[V6-12v] Hesitation at first start

[Tom Christiansen]

Folks,

Sometimes my 1994 90S shows an interesting type of hesitation. It happens 
every now and then. I start the car, and start driving. On the very first 
acceleration (away from the curb) the engine hesitates for a second or so. 
After that it's fine. It only happens on that very first start and that's it.

The cats are pretty old and I'm suspecting that they might have started to 
plug up. Does this diagnosis match the symptom described above?

Tom