did you take the chip out and drive it?
Is the replacement computer new or used?
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Sounds like a fun ride.
Code 15 indicates that the pcm has experienced a power interrupt in its KAM (Keep Alive Memory). You need to disconnect the pcm and test between pins 1 and 40 then pin 1 and 60, while grasping and wiggling the harness from the pcm to the dash ignition switch area. If you see a power fluctuation then repair the harness. You also need to be sure that NOWHERE is the eec harness close to any ignition component ie: coil, coil wire, secondary ignition wires etc. Some of the time I found no voltage to the KAM circuit and some of the time I replaced the pcm. So make sure to check the voltage. If both computers run the same with the chip out and voltage checks out ok, you may to look at a secondary problem. The bucking @ 2700rpm's indicates to me a secondary ignition breakdown. This is a typical scenario for ignition failure, high gear and low rpm's. This is exactly how I diagnosis ignition concerns today!, when road testing a car. You could have a concern with induction in the way the secondary ignition wires are routed. On the 15426378 firing order make sure #7 & 8 ignitioin wires are NOT paralell they must cross each other or be seperated from each other. Run another wire between them at the cap. More than once has someone brought a car in with buck and a miss with the plugs wires bundles together with a zip tie! A definite no-no. Remember code 15 could only be a loss of voltage to the pcm. Pin (1) should have voltage at all times, and pin(s) 40 & 60 are the ground side. Pin 1 is only the KAM circuit and a lot of guys disconnect the computer and/or battery when going the track to reset the fuel and ignition tables to get quicker et's anyway generatng a code 15. If the code is just a loss of voltage on pin 1 then I don't think this is your concern for running bad. If the voltage is good then I believe the pcm could be the cause of concern, because it indicates an internal problem with the pcm which may be affecting more than one circuit. Good luck Happy Thanksgiving. I will be here to answer any further concerns you may have. I race as well autocross, 02 GT 5spd bassini full exhaust crazy horse performance tune, sucks when it is not running right. This problem can be fixed just may take some time.
With the code in koeo the pinpoint test says to replace the pcm without doing any testing...
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