That is a tough one especially since you don't have any codes, that really makes trouble shooting a bit more difficult. I wonder if maybe your timing is off? Typically when I get a misfire code, a vacuum leak, high/low fuel pressure or faulty ignition plugs/wires are the culprit. Have you done a fuel pressure test? As for the Ask a Tech section, that service is for supporting members and you can find out about the other benefits available here.