Like other have stated, it could be allot of things, O2s, vacuum leak, wires are high on my list of things to change too. I did notice you said the intake is ported. What part, are you running a 58Mm Throttle body. Those things can be a PITA to get right. Is the EGR still hooked up? faulty EGRs cause all sorts of odd problems and oftem don't throw codes.
If you have or access to a laptop I'd suggest looking at DataMaster. This is outstanding software and very useful for checking how the engine is operating and data logging.
http://www.ttspowersystems.com/DataM...downloads.html
The software can be downloaded for a free trial ( 20 scans I think, then you need to buy the key). You can buy the cable here:
http://www.aldlcable.com/
John
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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