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Well first of all the 156 didn't come until 1998 so I take it that you own a 155.
Anyhow, your problem could have many reasons, one would be an airleek and another could be a faulty temp-sensor for the injection.
Airleeks you could check by spraying "start-sprey" around the inlet and hoses while having the engine on idle, if it rews up you are having an airleek there you sprayed.
/mopar
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