what code is 133 on f-150 5.8 1992
Better recheck that code, Ford OBD 1 has only 2 digits not three.
A code 33 is EGR opening not detected
512 is also not valid, a code 12 is cannot control idle speed Low.
Go to you tube and search: How to get the codes on a Ford OBD 1 system, then watch those that come up, especially the Mustang one.
Looking for a Used F-150 in your area?
CarGurus has 214,994 nationwide F-150 listings starting at $1,300.
Search Ford F-150 Questions
Ford F-150 Experts