Mine does that occasionally. Then scares the hell out of everyone by exploding to life with a wicked backfire, shooting a blue flame from one of the pipes, then settles into a lumpy idle.
JM
lol that's exactly what mine does.
Whats maybe not obvious from that video is that its is 04:00 on a Friday morning at a busy campsite.
We woke up about 40 angry German RV owners and 10 angry English Rv owners.
As a result we are no longer welcome there. oops