I have been feeling similar things with my Palio MJD. Earlier, I would observe this phenomena of drop in acceleration whenever I take her out for highway trip but it used to happen once and only once at the start of the trip and after a spirited drive of 100-200 kms, the car would feel more lively and the problem would vanish for next thousands of kms. Searching on this thread I assumed that this is common for ECU learned Diesel engine when shifting from city to highway driving and removing that extra carbon built up through spirited drive is a best thing to do. However, the frequency of the issue has increased remarkably recently. - When I put it in 4th gear at around 2500 rpm, car would reach 80 and would refuse to go any further. I can feel this for 5-10 seconds (I usually lower the speed, downshift, push it harder and it may vanish) - Put a new airfilter yesterday. Felt peppy at start but after driving for sometime, I could feel the same problem. Btw, my airintake hose pipe keeps coming off from time to time and I keep putting it back, would it have anything to do with it. Showed it to FIAT and the guy said the filter is anyways kept after the intake so no worries, someone in the forum though, said that its not good for the performance as the hot air keeps going in the engine. - I have not replaced the diesel filter for last say 12K KMs. Would it have any effect ? - Car has clocked 59KKms and I have never done EGR cleaning. - Car is running on Mobil Delvac 1 Fully Synthetic Oil. Any pointers ? I can see that the next thread here talks about EGR cleaning. Will check that out , but some quick questions till then - How much time it takes to clean the EGR, would FIAT do it ? How much do they charge for that ? Along with EGR, I should clean - manifold, inlet and what ? Thanks in advance.