Susan, once you have the car running properly you will have no problems getting halfway across the country on it. Just bring some basic tools for it and a few spare parts. I, for one will recommend a spare heater control valve. These things can go suddenly and the failure mode is the car pumps the coolant out through the failed valve onto the road. Very bad. It does not happen often, but when it does, it's a show stopper until you replace the valve and coolant. Not difficult to replace and the the spare costs something like $20 (I don't remember exactly). So most of us carry one in the trunk.

Also, if the fuel relay needs repair, it is easy to do and once done will not fail. You may want to look at it now as part of this problem. Look it up, pull the relay, bring it inside and carefully open it up. You will see a failure as a burned out trace. What you do to repair is jump that break in the trace with a wire and some solder. That's it. good for another 250K miles, at least.

Keep us posted with your progress.

Good luck.
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers