s type fault codes

hi can anyone help my late 57 plate s type 3 ltr petrol has been parked up for about 2 months under cover, went to move it the other  day now showing gearbox fault ,no cruise ,available ,running in limp mode,abs fault, put it on my mates computer also showing o/s  rear abs sensor fault and also showing misfire  on 1 and 3 coil packs. changed the battery for a new one no difference, also changed the rear abs sensor no joy tried taking battery terminal leads off waiting 5 mins touching + AND - no joy . the car was running perfect before being parked up, head scratching need the car for a wedding next week would appreciate any ideas . thanks in advance.