Hey everyone, I have a persistent problem with my 240 and could use some help. At what seem to be random intervals, the throttle will become unresponsive. As a result, the car will begin to slow down. Note that everything will seem to be working OK at this point (most notably the electrical systems, radio, etc.) other than that pressing the gas pedal doesn't do anything. Finally, when the car reaches about 35-40 mph it will reliably stall, but not at higher engine speeds.

I'm not getting any trouble codes either. It seems to be influenced by the air temperature, as when it's cold out, it's less likely to have this problem. So far I've changed the air mass sensor, crankshaft position sensor, and the fuel pressure sensor and nothing has worked. I also changed the oxygen sensor recently, so that seems unlikely to be the problem. I have a decent mechanical vocabulary, but am not terribly knowledgible in auto mechanic-ery, so I apologize in advance if you find yourself having to speak slowly and use monosyllables to get me to understand what the problem may be. Thanks in advance.

 

Sounds like it migth be a bad fuel pump relay.
Try to check and monitor the fuel pressure.