I forgot to add to theory number 4. I have an intermittent rough start. By that I mean once every one to two weeks, when I try to start my car, I will have to crank it for a while (up to about 5 seconds) and/or followd by a stumbling start. the stumble only lasts for the first seconds of the initial start up. I had a similar problem in my old teg. It had a B16 and did the same thing (more frequently and ran crappy) for months without throwing a code. Finally it thew the crank position sensor code and I just replaced the distrubutor, which in turn fixed the problem. I figure that the obd0 system is a bit more lax than the obd1 which is why it took months to recognize the problem? I just wish my current setup would throw some sort of a code to give me a smoking gun!