Technical Weird misfire intermittent

[NDT]

Hi. Relatively new here, driving a 63 plate Panda Twin air 4x4.
Currently in the middle of France, which is possibly beside the point, but, I am having some issues with an intermittent problem with the car “misfiring”. It starts to happen on long journeys. Fine when I am in 6th pootling along, then, get to a jonction/Roundabout and when I start to pull away the car runs really rough. Like it’s misfiring. If I drop down a gear and get off the accelerator or just back off the accelerator so the engine braking effect kicks in, it sorts it and it is fine. Until the next junction obvs. Any bright ideas. Took it to a dealer in Le Mans and they changed the plugs and brake switch but still not any better. Help.

 

[varesecrazy]

The wastegate seems to be working as you describe. The car is parked on dry concrete and there is nothing dripping. It’s doing my head in. I

Been a while,
Did you make any progress with this?

My last post is unchanged..
Only happens in warm weather after an hours running..
So I have looked no further
(changed oil brand.. But weather not going to be warmer for a while now..)