All,

Thanks for the response. The distributor rotor, cap, plugs, leads, and fuel filter have been recently replaced. I measured the leads and they're all 1K ohm +/- 10% so I think they're ok. The EHA has not leaks.

I'll try adjusting the duty cycle as suggested tonight and see if that addresses the stumbling, but it happens when cold (open loop) and hot (closed loop). As such, I doubt it's the mixture, O2 sensor, or cold start valve. The car was running perfectly just before this rough idle/stumbling issue.

I'm thinking it might be dirty fuel injectors and/or fuel distributor or faulty fuel pressure regulator. Anyone else think one of those could be the culprit?

I'll update frequently.

Again, thanks in advance for any insight.

Regards,

sjsfiji

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sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen