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On my 96 RMW, I've had a P0400 code for six months and not really done anything about it. the CEL stays on all the time now. I've tested the solenoid and it is fine, also put a new Delco EGR on and CEL stayed off for a few days, then came back on.

Here's the weird thing - i went to an auto car wash the other day, and after coming out of the wash, lo and behold, the light went off and stayed off for two days. then it came back on. Any idea why a heavy car wash would do this?
 

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Try an AC Delco for the F-Body 6spd. They seem to be a more robust design.
 
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