Sometimes while pushing on the gas pedal trying to go faster and it just wouldn't go!!! It was like I wasn't even pushing on the gas pedal at all!!! I had to pull over to let other cars go by because I was just limping along. No check engine light or anything....

Also, while pushing the gas pedal, the s the RPM index(indicator) goes slowly at the starting and takes longer time to reach its max.

I replace the air filter and diesel filter but it didn't works!