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Crud, OBD1 & it's cryptic coded messages that don't help diagnosis. You need a paperclip to start self check.
Firstly, a good decrudding of the ground connections is in order, along with a long grok of the description of cause found somewhere online. It's 20+ years old and a lot of the control harness has become brittle and inflexable, subject to intermittent signal when the engine moves on decel...
If the light doesn't stay on, it technically isn't a CEL. It needs to be ON or flashing about once a second.
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