How hard is it to change the PCM on a 2004 town and country on 2004 Chrysler Town & Country

How reliable are the remann computers. Will the car run at all if the pcm is bad?

Asked by for the 2004 Chrysler Town & Country
the part is not hard to change but it needs to be programmed to your vin # and r/b are a gamble. who diag the pcm bad?
They got a P2308 code so they changed the plugs and wires and the coil started smoking and the van still ran real bad. Then they changed the coil still didn't fix it so now they say the PCM is bad.
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