2001 Jaguar XJ8 Idles rough while sitting

Question edited for clarity.
Question moved to Ford F-150.

The first thing you must do is to connect a code reader and find out why the Engine Check Light is on. It is a 1998, so the information will be basic, but it is a starting point.

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Go to an auto parts store and have them scan for a code. That should give you an indication of what is wrong with it.

simple test for a vacuum brake booster
star and run the engine at idle without applying the foot brake
if it gets worse when the foot brake is applied , it is a vacuum leak in the booster ( replace the booster )
otherwise check for failed vacuum hoses including under dash control lines , vacuum leak at the manifold or EGR unit

check for air leaks or vacuum leaks around intake at the throttle body, be sure the rubber on the plastic of the air intake is sealing on the throttle body. may also have bad valve cover gaskets allowing oil into spark plug holes deteriorating the coil boots and causing a misfire.plugs will be good til about 80,000miles

the gas gauge is not related, that would be a defective gas gauge sending unit in the gas tank, the check engine light indicates that one of around 200 poss faults has occured in the electronic engine controls, you will need to have the OBD 2 engine control system tested for the fualt code that is stored when the light is turned on.

have you checked the o2 sensors on your exhaust

Take the car to a specialist to check the timing chain tensioners, they are a known issue. I`d advise you to not use (or even start) the car till theyve been ruled out, the engine could be made scrap if the tensioners goes.

If it does need tensioners, get the later metal type ones fitted.