It's been while I have this problem it only occur when I hit gas pedal hard like from zero to 40mph between 1to 3 rpm the car have like gurgling noise! Then after 3 rpm the car goes smooth and fast . I'm planning to replace the spark plugs and spark plugs seal and pulling the intake manifold to clean the injectors and the throttle body maybe also replacing the intake manifold gasket if it's not cracked I like to add some gasket maker and re install the manifold ,
I'm not sure if this will solve my issue any other ideas ?

Xj8 here not xjr
​​​​​

 

Any warning lights flash up? It sounds like a misfire, but also transmission/torque converter - if you can plug in an OBD reader and see if there are fault codes logged, it's a lot faster than guessing.

 

Obd shows nothing I had maf code month ago I cleaned it and deleted the code no misfire code or transmission codes thankfully . I highly believe it's the spark plug seal because I saw some oil around few spark plugs . Maybe clogged injectors gonna tune up the engine and see how it behave

 

It was the fuel pump