So... After having the external fuel pump, air filter, fuel filter, idle air control valve, mass air meter, spark plugs fuel injector temp sensor and crank position sensor replaced and the 25 amp fuse cleaned, the car ran pretty good- there were a few times when the idle would suddenly drop, but not stall out. The other fuses are clean the alternator checked out ok and the battery's 2 yrs old

BUT, all of a sudden it started making quiet popping noises today, then suddenly I lost almost all power and when I pressed the gas nothing would happen- then it would suddenly surge forward a couple feet and then I'd lose power again. All of a sudden it ran fine again for at least 1/4 ml. Parked it for a couple of hours and when I started it, same weird symptoms... Managed to get it the other 1/4 ml to home. I checked my ECU and it has a yellow label- could this latest problem be another symptom of a faulty computer that somehow 3 different volvo mechanics have missed??

Now I'm really really at my wits end and feel like I can't find a decent mechanic out here to save my brick's life!!