Because it's old
replace cam shaft sensor,location behind main pulley
if its not turning on then its broken.
Fuel pump failure is one possibility.
Over 20 psi at idleUnder 80 psi while driving Over 20 psi at idleUnder 80 psi while driving
Check for spark & fuel when it's dead and go from there.
Sounds like to me you need a wheel bearing
Change the fuel filter first,
tie rods
It's probably a broken engine mount. I have an 04 Alero and mine was broken. Jerking stopped when I replaced it.
have brakes check
A cop can always pull you over at any time.
Maybe a bearing is going, a balljoint, or maybe your brakes are catching.