Hi everyone.
Long time reader first time poster

I´ve been reading a lot of posts regarding misfires on the X-type and I learned a lot thanks to you guys, but apparently not enough .
My X is misfiring on odd cylinders (sometimes 5, other times 1 and 3 ....), so I changed some parts that you guys sugested that could be the cause of the problem (IMT O-Rings, brake booster vacuum hose, breather hose for the intake manifold) but unfortunately it did not work
My car is not a "normal" jag, because I had it converted to run on LPG several years ago.
The thing that gets me confused is that when I change to run on LPG it runs great, but misfires on petrol.
Knowing this, I think I can discard plugs and coils because if they were the culprits it would run even worse on LPG.
Can any of the experts here help with this (un)common problem

Thanks

 

Is the petrol reasonably fresh, old fuel may have lost its zing, or have water in it. I would then check that the pump is running correctly and check fuel pressure while running. Lastly, have the injectors cleaned.

 

Thanks fred for your inputs
The fuel is fresh. I even added some additive to it to try and "clean" the injectors.
The fuel pressure is OK (at least is what my obd2 reader tells me)
The fact is that this started happening as a VERY rare thing, but now it is always happening.
I was trying to leave the "clean the injectors" as a last resort :|