I have a 2002 Buick LeSabre with the 3800 II engine. Engine will will start, then immediately die. You can rev the engine at start instead of letting it idle and it will rev and then die after about 10 seconds. Removed the MAF sensor and no difference. Does this mean that the MAF sensor is bad? Seems most forums i’ve Looked at say that is one of the parts that is to be replaced. The part is expensive and so changing just to eliminate it as a possibility of being the problem seems a waste. Is there a way to test it? Shou;d I go to a “pick a part” place and pull one off another engine?