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Fuel pumps are common on these cars. Its a hard fault to duplicate with a gauge because they rarely die at idle! I would still connect a gauge and see pressures though, see what happens to them when it starts to die (if it will at idle). 99/100 times you need to replace the fuel pump, and fuel pump relay. The relay overexcites and burns out your fuel pump. As long as you dont have AWD its not a difficult job, if its AWD then you have to lower the whole back end of the car (springs, diff, AOC....) to lower the tank enough to get to the pump. Make sure that you align the pump correctly or you will have a false fuel level reading.
I'm having the same problem. At first I thought it was bad fuel so I replaced the fuel filter to no avail. Then I cleaned the Mass Air Flow sensor which also didn't work. Is your check engine light on?
I would first replace all of the Spark Plugs first and put some STP Super Concentrated Fuel Injector Cleaner in your gas tank and drive it arounf for awhile and see how your car responds.
Try replacing the spark plugs and I HIGHLY recommend factory plugs, they run way better and last way longer. From LOTS of personal experience. Plugs are the most common cause of misfires in a Volvo
it sounds like this problems is related to the ETM, or electronic throttle module. if software download was already performed, next step is to clean the throttle body bore. ultimately, the module may need to be replaced.
These models had a problem with the electronic control modules, and this is what controls the idle speed. Sometimes they just need to be cleaned, but sometimes they are defective. Volvo has extended the warranty on some of them to 10 years or 200,000 miles if it is found to be defective.
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