Check the condition of the trans. and motor mounts. If you see any fluid leaking from the mount it's done and needs to be changed.
Maybe try cleaning the MAF with approved MAF cleaner (don't use brake or carb cleaner on it). Just spray the tiny wires inside the MAF and let it dry. Don't scrub/touch them with anything or they will likely break and then you're out $150 for a new MAF.
At 144K I see no reason why it would be on its last legs. Heck, my 00 GPGT has over 200K on the motor and 300K on the body and still looks/runs good.
For the brake light coming on check your emergency brake. Often if it gets pushed down a bit or the sensor gets misaligned it will light up the light.
