What happens @ 2K rpm in open loop?

[brownfinger]

I've been dealing with this for about 2 years and it just keeps getting worse. When I 1st start my cold engine it runs like crap. It idles and revs just fine, but when you accelerate: Bucking, stuttering, like bad plug wires, but the wires are OK. When it warms up th engine runs fine. The other day I decided to go back to basics: Soldered new wires into the ends of the harness at the CTS where the insulation was cracked, checked the timing, reset the BISS, then disconnected the battery for a few minutes. The timing checked @ 8* BTDC, one * out of spec. I set it to exactly 5*BTDC, then did the BISS adjustment. This made the car run about 100 times worse. In fact, it's so much worse that it's now really obvious that the problem exists only up to 2000rpm. At exactly 2000rpm the engine proceeds to behave just fine, even when 100% cold. I'm stumped. I'm going crazy replacing parts that were just fine untill I broke them while trying to test them. Is this an ECU problem as opposed to a sensor or mechanical problem?
I don't know for sure, but it's always seemed to me that the ECU runs different programs for different rpm ranges: o-2k, 2k-4k & 4k-7k in both open and closed loop. Does anyone know this stuff? If my ECU is toast, and that's causing my problems, I'd love to take care of it and stop f-in up a bunch of expensive stuff that was OK before I started messing with it.
Anyone?

 

[nickclay9395]

start with checking your ecu.... smell any rotten eggs and you gotta problem.. but other than that your getting into uncharted tarritory for this reg joe to understand./