engine acting crazy, please help!

My car started acting very weird a few days ago.

while idling or driving, the car jerks sometimes (rpms rapidly drop like the engine would want to stall or something) sometimes just a little, sometimes completely cuts off while driving.

This happens completely randomly, one day it's completely fine, another it's happening every few minutes, sometimes it just drops for a second and then it's fine the rest of the drive. If it stalls it sometimes starts back up at first try, others i have to keep cranking a couple of times it feels like the engine is not igniting.

things i already checked/replaced:
MAF, distributor, spark leads, injectors, checked all vaccum lines, fuel system

spark plugs are next on the list, then i'm going to try it with another ECM

can anyone point me to the right direction? my guess it's electrical/ignitions system fault, but the ECM is not showing any fault codes.

Thank you for any tips or advices

Fuel filter, loose earth to the engine/mani, or ecu water temp sensor

found the problem, it was a loose earth to the power unit

Gedis wrote:found the problem, it was a loose earth to the power unit

Glad you got it sorted mate.
But what power unit do you mean? Battery? Ecu?

the little thingy that is mounted at the bottom of ignition coil, 3 wires one of then is ground and it wasn't grounded