Exhaust blowing help needed.

[sevenfourate]

they dont run a choke...just put in more fuel and up the revs...

like most cars they will retard the timing to get the cat up to temperature and this can cause them to sound a bit rough/blowing first thing

we used to have an air leak probe/tester that picked up leaks from air systems or exhausts - not sure if they are available these days

I have been educated.....

Appreciated