Q: check engine light comes on and stays on ... on 1994 Mazda B2300

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
after engine warms up ( 30 seconds) check engine light comes on AND idle drops down to 350 rpms at the exact same moment . these conditions remain thoughout the driving trip.
(1) Answer
The check engine light being on is telling you that the computer has detected a malfunction in the engine/emission control system. When the light's on there are data and diagnositc codes stored which can be accessed using a scanner, and there is history available..
Find a Mazda specialist to scan the computer and find out what's wrong.
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