Idle dropping and hesitating on warm start up

jezza

Lifer
Here's the scenario...

Start the car from cold - no problem
Drive the car at running temperature - no problem
If I let the engine cool and go to restart, the idle speed drops so much that I have to feather the throttle to avoid cutting out. When I try to drive, the engine hesitates and after a few seconds it regains power and drives as normal.

Any ideas?

The only thing changed recently was fuel. V-power wasn't available so I filled with BP ultimate.
 
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