I have a 2004 X-Type with the 3.0 engine 115K miles
I purchased the car with unknown issues but it would only run in limp mode
So the shop replaced throttle body with a new one
After the throttle body, it would run up to 2800-3K rpm then misfire
so then I read many of these forums and:
1. Replaced both IMT seals(they were loose)
2. covered the brake booster vacuum hose check valve in silicone to seal vacuum(new one on order but 2-3 weeks out)
3. replaced both upstream O2 sensors
4. new air filter
5. new spark plugs and coils

It still misfires above 2800rpm
I have the Live Data readings for the car but I am not sure how to read them to know what else is possibly bad
current codes are:
P300
P301
P303
P305
P1313
P1000

Any suggestions?

 

You most probably forgot a few Zeros - your codes would be
P0300
P0301
P0303
P0305
They are all misfire error codes. 1, 3 and 5 are the cylinders affected.

If your system gives you the correct information, the additional P1313 says, that the reason for those misfires is a damaged catalyst on bank 1.

The P1000 is the least one to worry about. It might just disappear after getting rid of the other codes.

PS: But if you are lucky it may just be the upper or lower or both O2-sensors of bank 1, which are buggered...
PS2: I note that you swapped already both UPPER O2 sensors - thus, maybe it is the lower sensor of bank 1, or the Jag does not agree with the new sensors (that is possible as well)...

 

Are the misfires not/less present after getting up to temp?

Try giving it a quick rev when cold vs when it's up to temp. If it falls on its face when trying to rev it cold, but is a lot better or non-existent when warm, I'd lean towards intake gaskets, very common problem.

Failing that... When's the last time the intake was off for any reason? Specifically to service the rear plugs

 

I would follow the ground wire to the odd cyliinder coils to the passenger side fender well. You will see that they ground there. Pull off the ring lugs that are there and clean them up so the lugs are all silver (not brown - rust). Wire brush the terminal too. See what you have then. YOu have eliminated most of the misfire stuff. If that does not correct the issue, then I would be looking at putting a new fuel filter into the car. If things continue from there, get new fuel injectors.