One last q then... though I've been through the POHs a couple of times I don't recall a simple checklist for this. If I were to suspect my engine power has dropped a little, or if I detected a bit of rough running, I'd go for carb heat first. What else would you suggest checking/doing?
The "fleet" I'm privileged to be able to use comprises C150/2, PA28 and AA5 - so nothing fancy!