My opel coarsa 1.4 utility loses power but when i restart engine it runs fine for a while then loses power again

SOURCE: 98 gmc jimmy loses power to a stop

the fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.

SOURCE: at oil temp light flashes

sending unit may be faulty replace with new unit also check for a loose ground and or alternator belt

SOURCE: engine loses power and stalls

try adjusting the throttle position switch very hard to adjust right car will hesitate , not idle properly and hesitate when accellerating if not adjusted properly.

SOURCE: 2001 chevy s10 loses power, will not stall, restart runs better.

Sounds like your timing belt is stretched or stretching when it's under stress. Check your timing and start thinking about needing to get that or the Timing belt adjuster changed. Also run a bottle of injector cleaner through your system.

SOURCE: 2006 Ford F-150 5.4 engine. code

2006 Ford F-150 5.4 engine: code P0191 fuel rail pressure sensor circuit range / performance

First step is to change the fuel filter and test the car. If the problem still occurs: The fuel pump driver module was corroded through from salt and was malfunctioning. Bought a new one and runs great. Problem fixed. See pictures below:


This is why salt destroys cars.