Dave wrote:
Hi All!

OK, since the collective talent in this group greatly exceeds
mine and those around me...

Today the engine in our 151 (O 320-150hp)Warrior stumbled
during power reduction, and we were able to repeat the symptom.....

I'm a little hesitant to reply since I can't supply details or references, but
what the heck, this is usenet.

I've owned an Archer (carbureted O360) and have heard of other Cherokees with
this same symptom. I was told there is a transition in the carburetor at about
1500 RPM, and that many of these engines will stumble across this transtion.
Maybe it's a transition from the idle jets to the main jets(?), I don't know
what I'm talking about.

Anyway, I spent a lot of time and money trying to diagnose this symptom in the
Archer. Two owners later, the airplane is still around at my home airport, and
I'm told it still has the stumble. It gets you when you're on short final and
reduced power, and decide you need a little more power to get to the runway.

Dave