Hi,ive only really noticed this problem since fitting my heated front seats,but cannot be 100% sure that is the problem.The problem is when i put car into neutral the revs drop like normal but then carry on as if to stall the car,but then pick up again then drop off and pick up again, does this 3/4 times and while doing this the lights dim.Thing is car runs perfect but when it dips below normal idle its like it wants to stall,but like i said it picks up again,any ideas???