i have a 94 also, and i had alot of problems with the check engine light. this seems to be a problem with the 94's. i have had three of them, and know coutless guys with them, and every single one of them have the same problem. after hashing it out with numerous tech's, and experts, we have concluded that the easiest way to fix it is to take the cluster out, and remove the light bulb. trust me, you just might fight that thing for ever!
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