After 12k miles the Panda has its first problem. Problem of the problem is that its not everytime so it's hard to find by the dealer because it's never there when the Panda is checked by them.

The problem:
Driving normally, for example acceleration very little in third gear. The one moment there is no problem, the next (with my foot not moving at the pedal) the power is almost all gone, it drives but it won't accelerate anymore. Putting harder on the pedal does nothing. Pulling the foot off the pedal and hitting the gas again and it's all good, car is accelerating nicely...
No special thing that would say WHEN it would happen. One time it is in third gear, giving a little bit of power, the next time its in 6th gear driving 80 miles/hour steady. Then in once: it's decellerates slightly... Putting my foot of the gas, push it again and gone is the problem... Very strange.

I thought it would be the sensor (don't know the english word) of the gaspedal or so but the Fiat-dealer found nothing, no faulths... The car has an airbox and is remapped but when someting is wrong with that is has to do it always... Now it's one day a problem, then a week no problems at all, 2 days with problems, a week nothing, etcetera...

Anyone a clue?

If you have your foot resting on the brake, or it thinks your foot is resting on the brake, it can cause this. Check the brake light switch on the pedal is adjusted ok.

Really? So when you should tip the brakes it should have the same result? Can try that... But the power is not completely gone.

Allright, thanks to the tip from HP I've read some other Brake-light-switch topics and they sound very similar to my problem with the 100HP. Going to de dealer tomorrow to let it test. Will report!