My '97 grand am works fine most of the time but when running at normal hwy speeds will suddenly take to lurching and hitching and losing power. after a few seconds of this it will then smooth out again. i just had the injectors cleaned and no difference. any ideas?
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Check your transmission fluid to make sure it is at the correct level and that it is clean. It is possible that you may have a clogged filter, when was the last time the transmission was properly serviced with a fluid and filter change?
code p0320 refers to cam shaft position (CKP) sensor/engine speed (RPM) sensor--circuit malfunction=== causes --wiring--CKP/RPM sensor ---ECM
because the engine runs ok until it is on cruise control I would be investigating the RPM sensor for a fault
The cruise control takes its control from the RPM sensor and if that circuit is interminable the the cruise control doesn't know what rpms to maintain.
Caravans are known for transmission failures. Sometimes it's just a speed sensor or computer problem, but most of the time you need a rebuilt trans. Don't fall for the trans flush might fix it story. On older or high miles trannies, flushing can cause more problems than it solves. Find a good trans shop not just your regular garage and have them take a look. If you do need a rebuilt trans look up engine and trans rebuilding shops in the yellow pages or google. Buy it directly and save a lot of money. If you regular garage won't install it for you then find an independent mechanic that will (some garages won't let your bring in your own parts because they lose all the money they make by marking up the cost of parts).