Surge?

[ryno11]

I was shutting my car down and as I turned it off the engine revved for a split second and came back to idle. I do have a turbo timer so is this common or what? While driving I also noticed a humming sound coming from underneath the car towards the rear. It sounded like when you have an amp and you get that humming noise through your speakers.

[turbolarry]

It's wierd huh? The same thing happens to me, but only if I turn the key slowly. It's on a turbo timer also.
As far as the humming noise; maybe check/change the rear diff. fluid.

[Warrtalon]

Haven't experienced that, but I don't use a turbo timer - no hum either despite 20k miles of racing quite a bit. Can you hear the hum at idle? If so, then put it on a lift or on jackstands to get under the car and try to pinpoint the sound.

[ryno11]

I notice the humming after a long drive....I commute a long way to work and by the time I get to work the humm is very noticeable. It fluctuates as I give it gas or let off.....could it be my fuel pump?