Third bent firewall????
Them's fightin words! I've only bent one firewall!
Jaba, the situation arose because of:
1. Finger trouble by me.
2. The last entry on the MR was "engine surging on Left fuel tank" with a "no fault found " sign off.
3. Some time ago I'd had to deal with a busted vernier throttle that made life interesting on the same aircraft.
So my nasty suspicious mind jumped a mile to an (erroneous) conclusion, landed quick smart thanks to a very efficient YMMB Tower, and sorted out what had happened on the ground. For the record, Pornstars have a very effective carb heat, much more pronounced rev drop than Cessna or Piper products.