I know there is quite a few posts about this, but few gave many answers. It sounded more like no one has figured it out yet.

My GF's 96 cav has an ETS and CEL come on at the same time. So it is obviously a related problem. I just recently changed the head gasket and checked over all the vacuum lines and they seem fine. But I dont know about the stupid plastic vacuum line idea. BTW it is a 2.2. I guess my first question is if anyone has swapped out the plastic style vacuum lines for rubber ones. Seems like a much better idea to me. Or is there anywhere that I could buy that top peice on the throttle body that all the vacuum lines connect to? I am lost for ideas and am searching around the places that I dissasembled the engine for possible soutions to this problem.

well i checked it out for ya and it doesnt seem to me that it would have anything to do with your work on the head at all. I found that i dont have an ETS on my car....

The Enhanced Traction System (ETS) limits wheel slip during acceleration by cutting fuel to certain cylinders, by retarding the ignition, by upshifting the transaxle, or by some combination of the three. The EBCM monitors wheel speed through the ABS wheel speed sensors. When one or more wheels begins to spin faster than the others, the EBCM calculates the reduction in torque needed to stop wheelspin and restore traction. Depending on the torque reduction necessary, the calculated torque reduction is a combination of fuel cutoff, spark retard, and or upshifting the transaxle. This reccomendation is relayed from the EBCM to the Power Train Control Module (PCM), which manipulates fuel cutoff and spark retard to produce the requisite torque. If the wheels still spin, the PCM requests an upshift to the next higher gear.

now with all that said, get the CEL code shecked and fix that and that may fix your ETS... let us know man. good luck!!!