It is not direct injection and will allways need heat to start it at 130k.When cold is often no problem but when warm the temp sensor that controls the glow plug relay will switch the relay off or cut the time down too much. We used to make a modification which cured this. Some did have a drain back problem but very rare and a blocked with leaves pick up filter caused starting problems with one mainlywhen the fuel level was low in the tank.
The timing chain will be wearing at this mileage, the cam timing will be retarded and performance will be down a small percentage as no doubt will the compressions, both related to oil quality over it's life . The pump drive will be retarded too but the pump will compensate via it's sensors.
This won't affect tickover unless as already posted it is too slow, 10 rpm can make a surprising difference.
Of course there are other factors re roughness, needs a diagnostic to analyse it at same time as sorting tickover.