[ozI30CW]

My 2012 i30 CRDi FD manual wagon (with 365000 km) has suddenly lost power below 2800rpm
Drove to work on Thursday without a problem.
Got in to drive home, started perfectly, but no power.  Pushed accelerator to the floorboard and revs very slowly crept up, then suddenly at 2800rpm, away it went.
If I let the revs fall below 2800rpm, I battle to get them up again.
Drove home (68km) keeping the revs up.
The next morning it started perfectly, I was ready to take it to the Hyundai agent but the problem was gone!
But that evening, the problem was back again, but worse - idles terribly.
No error lights on the dash.
Got my local mechanic friend around with diagnostic scanner and found no fault codes.
Because it restarted the next day, I would be suspecting a faulty sensor somewhere, but the scanner showed nothing.
Any ideas on what might be wrong?
Thanks

[b2goodbath]

this is Limp mode be sure you have done transmission fluid/filter and engine oil maintenance so you don't have bigger problems later...

[nedkelly]

Can be the fuel filter housing.  They often get minute cracks which draw air and cause poor acceleration.  Replace with one from a breakers or new and fit a genuine filter not aftermarket.