Hi,
I was driving into the motorway, accelerating up to speed limit (100km/h), was doing around 85 in 4th gear in a uphill, and suddenly, I feel that the car isn't pushing, I look down into the instrument closter, and my check engine light is flashing, attempting to give a little more gas, and I see the car is losing speed, I decided to put it into 5th gear, and apply slow pressure on the throtle, since the road was straighting up, and was very gentle with the throtle for the rest of the way. Stop around 2-3km away, and check the oil pressure, temperature, battery, etc. waited around 15mins and decided to drive again. And once I apply more than 35% throttle the car slows down, and the check engine light comes out.

When driving in the city and pushing in 2nd and 3rd gear, it's doesn't struggle like this, I thought it must have been a sensor for the direct injection, but the signs doesn't point to it?

This is an Audi A4 B6 1.6 2005, driven 186 000km.

Regards,
Zaen Khilji