2001 Chrysler Neon

Got a good one for ya'll. It seems I might have a pcm on the fritz but throwing
no codes. Everything runs good except when the check engine light comes on it
will miss a bit, AGAIN no codes. When the check engine light comes on the abs
light comes on, the speedometer quits working along with the temp gauge and
the odometer shows NO BUS. I've inspected all the usual suspects, grounds,
connections and connectors, sensors. Sometimes it will work right when I
check connections or when I make a sharp stop or turn key on and off while
running but after a couple of minutes the check engine light comes back on,
again it throws no codes.
What do ya'll think.