I've read a few posts where some face the same symptoms that my E30 has. Under normal cruising and sometimes under acceleration my car would stumble for a split second and the CEL will flash simultaneously. It feels like it loses spark really quickly and recovers. After it happens a couple of times each trip, the car runs super smooth. I have replaced the CPS, Coil, Cap & Rotor, Plugs & Wires, tested the TPS, my ICV buzzes, AFM is known to be good. Any input as to anything else i should check would be appreciated. Anyone in the San Diego area have an E30 with the 173 dme available for me to try out would be helpful too. Thanks