Can anyone help me with a strange problem I have with my Holden Commodore VE Omega 2008 60th Anniversary Edition 4 speed Auto? I recently had the engine totally serviced/coils etc. due to loss of power and oil pressure, which made going from top to third under load really weak. Engine now runs sweet as a nut. BUT It still seemed rough changing gears under load, so I had the transmission serviced. Gear changes now seem smooth BUT If I am sat at lights, in drive, the car will randomly "kick", like someone is hitting the underneath of my seat with a hammer. It doesn't always do it. Some days it drives fine. The car seems fine under load and at speed. I just get these occasional "kicks". I assume transmission but mechanic says nothing obvious came up during transmission service. I also had a mount replaced in the middle. The car feels like something is "loose" which hits something, maybe when at a certain idle speed, or temperature or maybe vibration point. The engine remains smooth, so at a bit of a loss.... any ideas?