Hi guys just wondering if any 1 can help with what this could be or how much it will cost to fix. When my revs hit 2250-2500 with the accelerator flat my revs will drop down and then pick up again, as if its surging. But when the gas is not flat to the floor it doesn't do it no matter what rpm. Not sure if I'm posting this in the correct place. Any help would be appreciated, thanks