2012 Hyundai H1 diesel automatic transmission and sometimes when I step on the accelerator the engine does not have anymore power. It is like it is stuck in that power range or muffled and cannot give anymore power. This is when going around 60-80 km per hour
But I can pullover and turn off the engine and wait 2-3 mins and then start off again and it has the power it should, then sometimes it may do it again and I pullover and do the samething. 
Any suggestions as what it could be. 

Probably sticky SCV valve

Change your fuel filter first off, cheap and easy to change and then it removes the fuel delivery issue as a starting point for further trouble shooting if it does'nt resolve it

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On 1/15/2018 at 1:11 AM, Anythingleft? said:

Change your fuel filter first off, cheap and easy to change and then it removes the fuel delivery issue as a starting point for further trouble shooting if it does'nt resolve it

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changing the fuel filter fixed the problem.

18 minutes ago, zeekgarcia said:

changing the fuel filter fixed the problem.

Change it every 20,000 km 

Do not listen to the mechanic (A vehicle schedule may say 80 - 90,000 )

The fuel is ad depending on where you fill up

 

When I bought my first Toyota the man said " only use Shell or Caltex "

13 minutes ago, zeekgarcia said:

changing the fuel filter fixed the problem.

Yes Diesel engines are prone to suffer more so than petrol 

engines if the filters are not replaced regularly.

 

In addition to the fuel filter the air filter also should be changed frequently as it affects the air inflow which creates over fueling

hence black smoke from the exhaust.

 

Sometimes the simple things are overlooked when problems occur.

Cast into the old style Caterpillar fuel caps ...

 

Buy Clean Fuel, Keep it Clean

 

For a VERY good reason