The main causes of backfire in any car are incorrect ignition timing, crossed sparkplug wires or worn timing belt (or chains and sprockets).
Front of the block, behind the motor mount.
yes but if you want to be sure measure from one stud to the other the distance should be 114.5 mm if it is a 5 stud rim
go to aa1car.com/abscodes and this should help you.
That depends on what trans it has. If the shifter is electronic then yes. If the shifter is not electronic then it is a three speed.