So I stumbled on a good eha valve from a junk yard for $20 bucks. The employee behind the counter had no idea of the value of the part. The owner was ticked when he overheard the final sale but let it go since his guy had already made the deal!

But...it didn't solve my problem... Over the last few months, the intermittent rough idle has become more consistent. Not sure where to go next... Plugs, wires, cap and rotor are all fine. I did take the idle valve off and clean it, but not totally thoroughly. Not sure if it should be replaced or what.

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Ty H.
'87 300E 135K Miles