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Speculating but without an error code ,it is difficult to do better- have you tried testing the CPS ? Search for the resistance spec.Easy to do.Can you use a code reader to tell us the codes? Better still find someone with a Durametric cable?
Then there is all the routine maintenance items that may be O.K. but sometimes the poking around reveals a problem - TB cleaning,Vac leaks, plugs etc.
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