What the heck is going on?! I have had 3 good "Jag" mechanics look over my 1994 (Nov '93 built) XJ40 to help me find a solution to this problem. I have tried all the obvious remedies - filter, cap & rotor, new gas, even a new "control unit", breaking the bank for me. I love the car but can't drive it. Seems like something small to repair - but I have dropped over $2K and had the car returned to me from 3 seperate Jag mechanics. My Jag is undrivable and this is a shame! Can someone help me?

Roger M.