That’s fine then! However, for the sake of five minute test he can eliminate the NTC sensor.The issue described by the OP sounds like a problem with the in-tank fuel pump (not the high pressure one on the engine). The only way to test it is to tap into the fuel line and attach a gauge.
My Ascaris however, are no longer for sale. At last, my exhaust now sounds really good. Alfa boxes breaking up at high revs but there is nothing - absolutely nothing emanating from the exhaust system before the boxes.
Starting the car this morning and it took a little over a minute for the engine to settle at 750 rpm and with it, noise levels settled out to a slightly louder than quiet tick-over. Perhaps I will get back the sound the Ascaris make above 3000 rpm.