I kind of have the same problem, maybe someone can share some tips with me on the subject, My 95 XJ, with original injectors and pump id imagine cause i got in 2001 and never did anything to them cept throw some cleaner in the tank every oil change. The car has the hardest time turning over if i just go for turning the key right to start. But if i just turn it to on and wait like 3 seconds for the pump to prime then it turns over like a brand new engine when I stick it into start. My buddy has a 95 also and his turns right over and he doesnt have to do what I do.