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94 Eldorado, and a 99 ETC
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Do you have any codes?

You can retrieve the codes from the dash LED without any special tools. All you have to do is turn the key on, the engine can be off or running. Then press the off and warmer (red) (or off and passenger warmer) buttons at the same time untill all the dash lights light up. Then it will go through all the modules telling you all the codes until it reaches "PCM?". You can turn the car off at this prompt, to exit diagnostics mode, or you can tap the off button once for it to repeat the codes.

Post the codes up here and someone will help you.
 
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