Idle not consistent, will sit around 600 then jump to 900 randomly after warmed up

Question edited for clarity and translated into written English.
Question moved from Ford to Jaguar category.

You should always take the upgrades. They are fixes to known issues.

All Diesel engines are slow to start as they need pressure and heat which happens after a few revolutions of the engine.

Rough Idle is normally because the Throttle Body and MAF need cleaning.

https://www.google.com/search?q=x+type+2.0+diesel+clean+throttle+body

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If you mean the idle speed, once she's warmed up the idle should sit around 900 rpm. Fast-idle maybe 1200 - 1500

sounds to me that you need to replace the points and condenser if thats not the case replace the high tension leeds with boogie cords

The only thing I can this is a vacuum leak, either a hose or egr valve.

I hope this helps!

sounds as if your mass air meter is badthis will cause the fluctuation in rpm it is located on the airfilter box

this sounds like normal warm up no other problems i have an 87 integra and its similar when cool

For this car it shouldn't go over 900, but should have a good idle around 700-800. It sounds like a lot, but my expedition idles at 700-900, depending how fast i want it to heat up.

Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.

Check intake gaskets. Pour warm soapy water on the gasket when it's running. If it bubbles like crazy, you have a leak. 2. Check timing. Shoot a timing light at the crank mark. If it jumps around a lot, your chain has jumped. #3. check cam. Remove valve covers, run the engine, and see if they are all raisng the valves the same. Put a piece of cardboard along the bottom, and fold it around a little, so it forms kind of a " half valve cover". That way you won't lose oil everywhere, and make a mess, or a fire.

when cold it will idle a tad higher 850 - 900 is normal cold , and around 600 warm. if it is idleing high after warm up then check for excessive coke<carbon> build up in intake and throttle valve.