There will be some that may diasagree, but my opinion after working on Jags for many years is that if someone gave me a 94 or older I would donate to charity before it killed me like the market right now. You have to really love those to want to weather the eventual problems that will creap up that built Jags older reliabilty problems in the public eye. From 95 and later the change from a mechanics view for reliabilty is night and day. As far as your problem, while it could be many things, I would really look hard at the crank sensor if no codes lead you other directions as they can be alittle problematic as the engine and sensor get to operating temp it increases resistance. You can monitor this by removing it and when checking resitance across the terminals heat up the sensor with a heat gun and see if the reisitance changes. if so change it