Problem with my auto VT6. When I put my foot down it sounds rough and shakey like its going to die then comes good.. Happens mostly when I first jump in or when I take my foot off completely and then accelerate(ie. corners, stops). I took it in to my holden dealer and he cleaned the throttle body, IAC valve and replaced the fuel pump. Its still happening and he suggested leads and plugs were the problem. Feedback will be appreciated before I take it back, Thanks!