I own a 1996 Jaguar Vanden Plas 6 cyl. Living in Minnesota, I only drive the car in warm weather and usually accumulate only about 3000 m annually. Being an old car, it’s developed some nuisance oil leaks which I think I’ve traced to the intake manefolds. Small leaks, but noticeable in the garage. My question has to do with the firing of the cylinders. Several years ago, the check engine light came on. Upon checking it read #6 cyl random misfire with catylitic converter malfunction. I think I changed the coil, fuel injector and spark plug on #6. The problem resurfaced some time later with codes reading randome misfires on # 1 and # 6. Now the problem is back again, but worse. After driving for about a hour, the engine spontaneously shuts off when I slow down at a corner or stop. Doesn’t do it all the time. I thought it might be fuel, but codes read random misfires on #6 again.