Opel astra 160i 1998 euro. idle very high between 2000-2500 revs/min. i changed the idler valve and cleaned the throttle body and checked for leaks on the map sensor sense line but still have the same problem.

SOURCE: PO171 OBD-II Trouble Code " System Lean To Bank 1

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

SOURCE: 94 L reg clio 16v 1.8 tickover irregularities

Sounds like idle air control valve sticking. If i remember correctly, the idle air control valve is built into the throttle body. This is the part that connects between the air filter and inlet manifold. take this off and clean thoroughly with carb cleaner. if this does not work, then renew part.

TL

SOURCE: '90 3.1 lumina euro idles ok but tries to stall when accelerated.

If the cat is red then it is probably plugged if the motor can't exhale it wont run at high rpm

SOURCE: high idle CHevy 350 TBI

check if went from a V6 TO V8 need power two more cylinders

SOURCE: 1998 Jeep grand Cheroke hard cranking, sputtering, rough idling

In READING what you wrote, it appears that your car is difficult to start and pretty much is rough while running....It also appears that your are randomly replacing parts...How did you verify that the parts your have replaced had failed? I suggest you get a basic manual like chiltons or haynes as well as a decent digital volt/ohmeter, then do some testing. Pay close attention to map sensor test and manifold air temp. Having a good fuel pump does not insure that your injectors are clean enough to deliver a good spray pattern This will not show up on any test...you need to actually look at them. There are other items to look at but I think you will likely find your problem in what i mentioned. (you already checked for vacuum leaks, right?)
Good luck!