Engine accels without warning on 2002 Dodge Ram 2500

2002 Dodge diesel 2500 5.9L I6 Tempature guage goes up and down w/no warning, also engine revs out of control. CODES: p0577, p0118, p0123, p0343, p0606, p1286

Asked by for the 2002 Dodge Ram 2500
I have used a company in your area to test and repair those computers
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We have had a few of these truck's come in with some of these codes, performed diagnostics and found the engine computer defective, computer on the engine, not the pcm.