so you Have a 94 LWB..Well Like most New to you Land Rover Classic owners you are going to do all the wrong things first. Since your on a forum asking questions that are really quite basic in nature, I will assume you are not familiar with auto mechanic work. Not trying to be an A$$, really I am not.
Lets start with your list
Seepage from Transmission lines.....Fix it. They are not expensive. They are available. Transmissions are expensive.
Oil Pan leaking..... Well if you are sure thats the problem fix it. It's not hard.. Clean everything under the vehicle that has oil on it. Then see where it is coming from.
Leaking Ball joints.. Just fix the damn seals. It is not that hard of a job, and they wont leak again for 20 years, provided the ball is not rust pitted too bad. And use the "one shot" grease recommended. Its even called that. Be sure to turn the wheels so you can get the grease into the hole past the ball!
Brakes...Did you take the wheels off to get this measurement? change them out.
Rough Starting...You think you have a sticky injector?..Run a fuel system cleaner, But I suspect that nothing is wrong with the injector. No spark means no fuel being burned. Change the cap rotor and wires. The wires are probably old and cheap. I have had to replace the spark plug wires on my 94 LWB a couple of times in one year. Buy good magnacore's and Change the plugs too.
As for injectors in general. They are controlled by the computer. The fuel injectors time open is controlled. by mass Air sensor and cats. No new modern injector is going to give you any noticeable fuel mileage improvement, unless you have faulty injectors to begin with.
Paint.....carpet etc...do yourself a huge favor. Get it to run correctly first. Drive it so you know its okay before you try to repaint, re-carpet etc. No sense leaning over that new paint when your working on it.
since you didn't note the Mileage I will give you a run down of whats possibly ahead for you. Okay no one ever flushes the radiator and cooling system. So... be ready to change the heater core when it leaks out onto the passenger floor board. This will occur sooner or later. 150k miles would be a good guess if the vehicle was not maintained properly, sooner than later if you live in a climate that requires Air conditioning, as this will really tax an unmaintained cooling system. The heater core job on a 94 LWB takes 12 hours for me and I have a lot of practice..lol. Buy a manual, look for land rover tool box videos on youtube for great videos on many things. Most of the videos on that channel are for defenders but they share the same drive train.before you drive it make sure to check all the coolant hoses. the 2 hoses that are at the back of the engine that go to the heater core are a real pain, so people never change them until they leak or burst. Monitor your coolant level(in the expansion tank, this will be very important to detect and coolant loss you may acquire. Become familiar with that level cold. Head gasket failure on your engine is a thing that will happen just a question of when.The more poorly maintained the cooling system the more likely it is going to occur. this is also why you want it running correctly..A lean running engine runs hotter so get it running correctly before anything else..
The transmission will never have been flushed. I would do that after I am sure it has no other issues. It is not easy to do, but there are videos of that too, the cross member is the difficult part, and a lift makes it a lot easier. trust me you dont want that transmission to fail.
Under the passenger seat rear is a little black box that has a display on it. This will show any engine codes you may have. You can see the codes here
JE Robison Service | Land Rover Troubleshooting: retrieving fault codes
You can see the codes and clear the codes easy enough.
When your looking at forums to find an answer to any questions or issues you have, do NOT take the first answers you find. look at other forums find repeated answers that address your particular problems. Google every question or problem look for answers on you tube. Many people will have answers unfortunately most of them will be incomplete or not accurate at all. I have completely taken apart every part of my 94 LWB. I listened to a lot of people some of them were very helpful. Most of them were not..
Good luck with the Range Rover listen to the father in law. All engines basically operate the same, Range Rover classics are particularly sensitive to ignition issues. cap rotor and spark plug wires, and the coolant temp sensor. (this tells the ECU how rich or lean to run the mix. The other thing that can cause you to have tough starting fuel smelling fun is the Fuel pressure regulator. I have changed my 3 times in 10 years. Okay well there ya go...Get it running properly then you can chase down the other gremlins...Good luck
