82T-Top

I heard it today from the drivers side about 10' from the car. I drove it about 6 blocks and that's when I heard it and then after a 5 minute drive i didn't hear it anymore..

HypromanGT

I have this noise, intermittently, and have had it for literally years (08 manual GT with 88k).

The key is that as the OP pointed out, the noise goes away completely when the clutch pedal is pressed in, so...not injectors.

82T-Top

hmmmm idk.... its very strange. when it made the noise in the drive thru the other day i was trying to listen to what it could be but it didnt stick around long enough for my to check anything it just stopped and after i went to the next window and didnt come back lol