My jaguar xj8 has a bad miss, I've changed spark plug, coils, and all fuel injectors are firing. When car is driving it all of a sudden acts as if its going into neutral. Jerks and shakes, it sit up for a few months waiting on parts the postal service delivered to the wrong address, I've cleaned the throttle body, ran a little better but not for long. Car has been running superb up until now.car came out of California and I drove it to back to Louisiana . Can this be an emissions problem? I need help please.

 

You need to get the codes read, either by a local parts store or get your own scanner, which you will need as long as you own the jag. Then report the codes on the X350 forum for the model beginning in 2004.