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Default Help needed! Stranded XJ with horrible idle/miss

Hey guys,
I have a 2001 XJ with the 4.0 petrol and as I was driving felt a big miss. The car now struggles to get up to speed but will every now and then clean up if I give it a boot. It struggles to hold idle if in gear but as soon as the load is off it in park or neutral it will idle OK again.
Driving at a constant speed it hard too with it surging or missing really badly.

Any help is greatly appreciated as I am on holidays with the family and am a fair distance from home with the jeep as our only means of transportation!

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Blocked fuel filter, man.

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It could also be a vacume leak. Have a quick check under the bonnet for a hose that has come off. Check the PCV valve and hose that runs from the top rear of the rocker cover to the intake manifold.
Symptoms of a vac leak can be an OK idle with no load because the IAC valve may compensate. Missing under light load and ok running when booted.
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Thanks guys, I really appreciate your replys and will check both in the morning.
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Check to see if it has thrown any error codes.
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Thanks for the replies guys, have checked codes and is not throwing any at this stage.
I feel like I'm down to the usual culprits being the CPS, CAS, upstream O2 sensor or fuel filter. Being a 2001 it's going to be hard to get to the fuel filter where I am on the goldy.
I have tried to start it again this morning and it will only just start occasionally and idles horribly now if at all. Anyone know where I can get a CPS and CAS over the counter on the gold Coast??
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Try resetting the computer. If it runs better, it is not your O2 sensor.
A coil pack could be cactus. I would have a workshop check your fuel pressure and do a live data scan before throwing parts at it.
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Thanks rustynuts, I have the battery disconnected now and will put it back on soon to reset.
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When I went to service the injectors, I discovered the fuel rail had a LOT of gunk in it.
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