Lima 4cyl is a pretty reliable engine, Ford used it in Rangers from 1983 until 2001, it was replaced with the 2.3l Duratec, not at all related to the Lima engines
Your spark system control is in the PCM(computer), so all you have access to is the coils, wires and spark plugs.
Ford uses a waste spark system, so each cylinder gets spark on power stroke and exhaust stroke, this cuts down on emissions but was basically done to save money, lol.
The 2.3l will have 2 spark plugs for each cylinder, they BOTH fire when engine is running, when starting only the exhaust side spark plugs fire.
Because there are 8 spark plugs you need two coil packs, one for exhaust side and one for intake side.
Same coil packs are used on the Ford V8s, for 8 spark plugs, but one per cylinder.
You can unplug a coil pack, while engine is running, to see if all cylinders continue to fire, if you get a miss then one of the two coils in the working pack is bad.
With both coil packs working you wouldn't notice that until both coil packs had a problem.
Plugs and wires are about the only tune-up there is, you can't adjust timing.
2.3l is a non-interference engine so valves and pistons never occupy the same space in the cylinder, the timing belt does wear out but if it breaks there would be no engine damage, in most cases, if you were at 7,000RPMs when it happened I can say, lol.
Fuel injection, as you know, relies on clean injectors with proper fuel pressure, on your 2000 that pressure would be 60-70 psi
I use a can of Seafoam once a year in the fuel tank and the injectors seem to stay clean.
2.3l is not a power house it was used strictly for MPG, and to that end they often put in high MPG differentials, 3.08 or 3.45
This made them even more "gutless" but made for great MPG
You can look at the drivers door sticker to see what you have, read here: Ford 7.5 & 8.8 Inch Axle Tag & Door Codes