Check engine light came on 4 months ago followed by "stalling/jumping" symptoms", diagnosed as MAF Sensor, we bought a new one and replaced it. Weeks later, same thing. Took to dealership again, they said the engine/computer should have been reset after putting in MAFS, reset it. A few weeks later, same thing, Volvo said it was a bad MAF Sensor again. Bought a new one through Volvo, replaced, and now check engine light on again after one week and same symptoms occurring.
Hard to start and very rough idle until rolling about 10 MPH. Prone to stalling. Trouble code for MAF and fuel balance right bank (didn't know I had a right bank!). Replaced MAF and had code cleared. No problems for 24 hours. Same symptoms and MAF code reappeared. Replaced MAF again (warranty). Less than 24 hours and ten miles later, same issue, same code. Help!!!
FIXED: After the third MAF, I found a good Volvo mechanic (not at the dealership). It was a combination of a dirty throttle body and a cracked vacuum line. $395 (not including the MAF which was actually good)later it runs like a charm. 10,000 miles, no problem. Two other independent Volvo mechanics also said it was probably a dirty/bad throttle body and/or vacuum, not the MAF.