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What engine ? Does it have CPI - center port fuel injection ?
some are worn but seem to still hold a vacuum ???? could you explain
Do you have a scan tool that reads engine sensor data ? Could have mass air flow sensor ! Crankshaft position sensor . Do you know how to test obd 1 engine sensors ? Test don't guess . Buick Electrical Part 3 Automotive Computer Operation 1990 Buick ,chevy all the same .
If you did't reset the computer then the computer will not reconize the new sensor.But if you have check your fuel pressure regulator there is a good chance if you see fuel in the map sensor or in the air intake tube its the pressure regulator.
They are the sensors that are in the exhaust. I believe that there are three in this van. Depending on what engine it has. They are the only sensors in the exhaust.
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