if you didnt un-connect the battery you could have fried it.
you could have left the battery disconnected. or maybe you drained the battery, you might have to recharge it
could be fuel filter
could be many things but start by having it checked for codes if possible. then check fuel pressure should be about 45psi. could also be a crank sensor, TPS sensor or other problem. when was the fuel filter changed last
no effect
The throtle cable is freezing up. Replace it.
get a new alternator and battery
Check the Power Steering Fluid level.
Have the alternator checked out.
Gonna need to know what is wrong with them to help you.
Probably a dead battery.
check your coil pack.
It could be a dead battery.