probably... I don't have that CD , but there has to be a vac line going to an Engine management module. That would be where to look b/c he is not getting Absolute Pressure from manifold communication...so the suspect would be a leaking vac line from the intake to whichever module monitors that vacuum signal. On 124, it would be the DM-N/59...I do not know where they get it on 201, but it has to be one of them. So, check all vac lines coming off intake, and specially one that goes to a module or vac sensor.

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A Dalton