It's steady when steady because its steady. When in control things are changing. The point is your car is having trouble handling control.
You can't use fault codes for other systems, not even other years. you must be specific. Being at home I don't have a code sheet, but there are links in these archives that should give a proper code list. It think CMP is camshaft position sensor and your car doesn't even have one. The 93 models all have electronic fuel injection (HFM on sixes LH on v8s) so they would have no codes the same as KE.
Bosch Master, ASE Master, L1
33 years MB technician