i just brought a y31 cima and the bloke reckons that it ran fine a few months ago but then it sat there for a few months and it ran out of battery so they jump started it and now it has spluttering tantrums. it runs fine for a little while either a few minutes or seconds then it seems that a few of my cylinders stop and the car stops somethimes to the point of the engine dying completely.i dont know if it has anything to do with it but the tacho plays games, sometimes sitting at nothing and then sometimes goes as far as it can and it seems to change when the engine plays games sometimes but im not sure. and as far as i can tell it has no head or head gasket problems. if anyone has any ideas could you please let me know.