Technical My Fiat Grand jerks sometime, and no gain speed somtime.

[Fiatdkdk]

I have Fiat Grand 2006, 1.4 petrol version.

The problem is my car sometimes makes small jerks when i accelerate.
And sometimes when I accelerate, the car does not pick up speed and the engine makes a loud noise like a helicopter.

The car drive fine but does these problems somtimes for 2-5 seconds. there is no error code on the car... what could be the problem with the car?

 

[GrandePunto PL]

1. The real question is, what kind of diagnostics you're able to perform (if any)?
2. This could be anything (wiring, sensors, coils, sparkplugs, injectors, fuel pump, timing - like VVT issue, ECU failure)...
3. What's the service history (are you tracking, writing down what was done at what mileage etc.)?
4. Be more specific. There are about 4 versions of "1,4 petrol": regular 8V (VVT and non-VVT in first year or two but it's a very rare engine), normal 16V, turbo (T-Jet), Uni/Multi-Air (turbo or not).