First four things that spring to mind are...
1) you have disturbed or haven't reconnected the engine earth properly.
2) you have left one of the small batty terminals off if you removed the.
3) you have dislodged the blue engine coolant temperature sensor plug.
4) you have pulled off or broken the map sensor pipe
Last edited by Stu @ M Developments; Jun 29, 2013 at 06:55 PM.