My experience is basically the same with most "old" cars I have driven. If I very lightly tap the throttle to just increase the engine speed slightly the engine feels less shaky than it is when it is at idle. Why does that happen?
Is it because:
- Because of the higher engine speed, cylinders fire closer to each other so each cylinder damps the vibrations made by the one before it?
- The vibrations are absorbed by the mounts with higher engine speed better than lower?
- The throttle plate is closed at idle so that makes AFR more exact making a harder bang?