Dnb is David blades from the isle of white. He used to do the occasional ecu upgrade. If the car runs rough on both settings then the problem is unlikely to be the Ecu.
I was a founder of the scoobyecu, more can be read at the start of this thread...
http://bbs.scoobynet.com/private-for...to-1996-a.html
I prob sold 500+ of theses a few years back.
If your car is misfiring it may well be faulty coil packs.