buick lesabre mass air flow sensor problems

might be defective, the original one tested fine when we ran it though the trouble shooting steps, but replaced it anyways. Mechanic said to return the Mass air sensor to Autozone and get a new one. any Ideas guys, I'm desperate for some help. Oh, Mechanic said, who knows that the pressures in the fuel system were back to normal, however I'm sure he didn't drive it for 45 mins till it got good and hot either. Had it at a mechanics shop for 1 1/2 weeks, he drove it daily, the car never repeated the problem, no codes showing up.

Replaced Mass Air Flow Sensor, fuel filter, new plugs etc., 7 weeks ago. seriously getting tired of chasing our tail replacing probably good parts. 2004 Buick LeSabre cranks but wont start. the error codes now are Mass air sensor and O2 sensor. usually when coming to a stop and the rpm is bellow 1, or you simply don't pump the gas hard enough while breaking. after driving it from Orlando to Jacksonville, on the way home the idiot light came on, and it rough idled on start, now its stalling again when hot, had to two foot it all the way home from dropping my kid off at Disney today and even still it stalled out once hot 5 times. I have a 2002 Buick Lesebra limited, we had a problem with rough idle, then stalling once it got hot, error code said Mass air sensor, so we replaced it, still had the same problem, took it to our local mechanic of 22 years, he said the fuel pressures were low and suggested replacing the fuel pump, so we had him do that, ran fine for 24 hrs, and then it started to rough idle on start, but no idiot light.

Buick lesabre mass air flow sensor problems