Engine light on wont go over 3000rpm or under 2000rpm

sounds like you are just hitting the factory built in rev limiter.

Jaguar wont rev 3000 rpm Questions & Answers - Fixya

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1998 Jaguar XJ8 won't rev over 3000 rpm ... Wont go beyong 3000 Revs s type 2001, wont go beyond 3000 Revs and it' in limp ... Question about 2002 X-Type ... My jaguar xjr8 year 2000 battery went dead started car went for short drive back ...

Jaguar engine cuts 3000 rpm Questions & Answers - Fixya

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1998 Jaguar XJ8 won't rev over 3000 rpm ... engine cuts out and shudders at 3000 rpm won't accelerateobd code p0332 2002 jaguar x type 3.0 l P0332 - Knock ... Car is boging out in park and will not go over ... driving, don't worry about it.

Rev Won't go up

www.jaguarforum.com/showthread.php?t=14662

run a scanner on the system to determine codes to diagnos problem

If you have a hih miles truck,it is very possoble you have aclogged cat.Have a muffler shop test pressure in front and behind by drilling small holes,checkin w/gauge,then welding back.This should be free if you replace the cat.

I think you should check the fuellines and for sure the injectors,these are most probably blocked.It can also be the fuelfilter that is clogged
Staert by replacing the filter and try to start.Once its starts leave it running stationary and remove the fuellines one by one from the injectors.If you loosen the first one and the engine rpm go down a bit you know the injector is good...tighten the fuelline again and move on to the next one and so on.

If one of the engine components is acting up, you should get a check engine light and have codes for the components. If the light is not coming on, it could be a suspension or mechanical problem.
Low fuel pressure could also do it.

You are dealing with a misfire.It clears up at 3000.RPM A jump timing belt can do this or a broken valve . Also a failed coil pack. Lets go with a failed coil pack.Because of the strategy that is used a failed on the engine smooth at 2000RPM (neutral) No. 1 and No. 4 are fire simutaneously and No. 2 and No. 3. simutanueously. with the engine running lift the plugwire to number 4 does the engine stumble if it does this is the working cylinder and there is nothing wrong go to number 3 you may have to use number 2 engine running wire pulled out does the engine stumble if there is no change you found the problem.Basically what yopu are doing is checking for spark at all the cylinders

Check for vacuum/intake leaks.

Do It Yourself Diagnosis and Repair

The rev counter could be faulty.
I hope the engine is responding ok on accelaration inspite of the rev counter being stuck on 3000rpm , if so thn its definately the rev counter being faulty.

Have the alternator tested. You are providing a low charge to the battery when you jump it and when taking it above 2K RPM requires more amperage resulting in the engine dying and the rough idle