littlelordfonts

Hi I have a 1992 2.9 vr6 engine fitted in a vw t25 van. it has been running extremely rich. local vw garage have found no fault codes and checked fuel pressure is correct. it is pointing to the ecu which has been previously remapped/chipped. Does anyone have any thought s that returning the ecu to standard should solve the running rich problem? It now seems after running the battery flat and recharging it it won't start at all! ttys to turn over but no spark? Help please!!!