I bought a 99 GP 159k miles and I've found it has every common problem..

Radiator builds no pressure.. It's leaking somewhere so I suspect the LIM gaskets or upper intake are leaking.

Valve covers leaking.. Need to do when when I do the LIM.

After 10 min of driving the trans goes into P1811 error mode..(hard shifts) so I need to do the shift kit and fluid change.

2 days ago after driving for 15 minutes it just flat died.. I Pulled over and it re-started and ran perfectly.. Suspect Crank sensor.. It has not done it again.

Headlights leaking fogged and crazed..
Taillights leaking too. (po drilled drain holes in them)

HVAC. Only high speed fan.. Will check resistor pack.. DRL is working so I don't think it's the ignition switch

What problem would you tackle first?