43 is a cylinder mis-fire code. (may or not be related )
Random shutdown is usually associated with either a crank position sensor or fuel pump failure. Taking into account the code you have, I'd tend to think it's more likely to be the cps. But... the coil should be checked and all wiring as well (for loose or corroded connections) Bad connection inside ignition switch can do this as well.
Parts are not cheap and therefore diagnostic mistakes are also costly. I suggest you follow test procedures outlined in most inexpensive manuals such as chiltons or haynes, before buying anything,
Random shutdowns are difficult to diagnose even for shops, as most times if it's running when tested, everything is usually going to check out as good. Don't get discouraged though. You eventually will figure it out.
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