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 .
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