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What symptoms does one have if PCM is not working?

(2006 Chrysler Pacifica)
in Byesville, OH on July 18, 2014
has 85967 miles. Never any mechanical problems
When stopped, holding break, if lessen pressure, car wants to lurk forward as if the break is fighting back. That was first sign of something wrong. Starting up after car parked, engine acted like not in gear to go forward, but did in a few seconds, acting like not getting gas maybe. Drove ok after getting started, until stopped at a light. Same reaction with break, then had trouble accelerating kind of jerked and struggled. Got it home, tried to rev engine, and couldn't. Engine light has been on and off for months. No one found why
Comes on sometimes when going down a hill and hit a dip. Light will go off for long time, then come on again. Is yellowI don't know whether to drive 13 miles to repair shop or tow. Thank you
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