my wife has a '96 subaru legacy 2.2 liter 4 cyl. and she wants to get a tune up cos the car sometimes seems to want to shut off while driving, and we had trouble w/ it a while ago when it rained so much. so the moisture seems to affect it. problem is, i know nothing about this car, what the ignition system is like... im pretty sure its EFI, but what would have to be done in a tune-up? it has newer wires and plugs. what would i ask for from a mechanic to make sure im not getting raped?