Re: 87 2.3l rough idle then dies
The IAC can and will diddle with idle speed. Sticky, gummy, or dirty IAC may cause the problem.
The MAP sensor, a cigarette package sized box with wires and a vacuum line attached will make the idle crazy.
If the fuel pressure regulator fails, it can fail rich or fail 'lean', with too-high or too-low pressure supplied. I make the assumption you have EFI.
You may be able to find a Ford-specific tester that uses a 9-volt battery and plugs into the EEC-IV connector. They were ~$30, but now go for about $10. Worth it, to test and for the explanations in the accompanying manual.
You may be able to pull codes and have them displayed on the instrument panel as some vintages had that feature. Check with the Ford web site for an owners manual in PDF format, which might have the instrux.
tom
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