I know that there is supposed to be a slight "hum" when starting the engine because of the air pump, but is it normal to hear the same sound during heavy acceleration after it's warmed up?
1996 Volvo 960

Hello, I just bought my first Volvo a few weeks ago. It's a '96 960 with 112K, pretty nice overall. Once in a while when I start the car for the first time in the morning I sometimes have to coax it to idle by pushing on the accelerator. It then idles up and down a little bit, evens out and drives f...