I'm getting an erratic idle. No check engine light, but when I pulled the codes, I got a DTC 6 on the diagnostic module (socket 19) of the 38-pin connector.

I reset the code and the problem seems to have gone away (at least for now). It has been raining here for several days and unusually humid for Arizona. The book says to "test electronic accelerator." Anyone know how to "test" it?

I'm hoping that it could be something cheap like a neutral safety switch?

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles

I hope it's not the dreaded $1800 Electronic Throttle Actuator. Check that the wiring harness is intact, but that's not cheap either. I think it's giving you an ETA fault, hope not.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

The ETA was rebuilt twice by the previous owner. The wiring harness has been changed too. Although I'm not getting an ASR light, I'm hoping the neutral safety switch is the culprit. Of course, Bernanke and Geithner are "hoping" that the economy will pick up too.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles