1992 Plymouth Acclaim 3l V6 engine problem

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I am having trouble with my 1992 Plymouth Acclaim.It has a 3l V6 engine and auto transmission.It starts fine and can be driven for about 20miles and then the check engine light comes on and the engine starts to run rough and seems like(limp mode).After it sits overnight it runs ok again.I have changed the fuel pump and filter,ECM,all 6 injectors,02 sensor,pick up coil,cap and rotor.It has only travelled 34K miles and is otherwise in great shape.A local shop looked at it and said they could not diagnose it as their scope would only work on newer models.Has anyone out there experineced this problem and solved it?

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