I agree with all statements.
The headlight switch trends to fry as well. Valve cover gaskets tend to leak, but $20 on some nice blue felpro will get you going again. The injectors may or may not be on their way out... mine are leaky at 155k.
The overflow is likely worn out too if you notice "lower than expected" power.
More fodder for haggling.
Edit: the oe headlights are crap more than likely. They seem to take on water very easily.
2003 gmc 1500hd quadrasteer "Miley"
2000 jeep cherokee "Herman"
1977 Ranger 150a bass boat
1987 Yamaha Moto 4 quad