I'd be inclined to wonder about the EGR valve myself. It's funny that it's not throwing codes tho. If it's stalling like that it should be throwing a code that it's running lean or something like that too... I guess you could check the TPS voltage as someone suggested and see if it's got stable increase/decrease. I can see that it would cause a stall if you opened the throttle and the TPS didn't send the correct info to the PCM to increases the fuel. Then you'd have a lean condition tho... Same as a carb with a plugged jet... You crack the throttle and it stalls because there's too much air and no fuel. On the other side of this you have the MAF sensor. Really... I thought the MAF was mostly responsible for mixture control moreso than the TPS. Anyhow, if it's not the EGR valve then I'd look at the voltage of the TPS. If it was good I'd probably go ahead and change the MAF sensor provided there's no codes suggesting something else. O2 sensors are another thing. Might check the wiring to them but usually they lead to a rich condition and gas guzzling.
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