I changed the air tubes last year, along with the injectors, and theirs seats. The new air tubes are a lot easier to install than removing the old air tubes. Just cut the old tubes into pieces. Also use some silicone lube on the air tube connections, and buy new connectors and air tube end plugs. The air tube job looks scarey at first but its quite easy, and very inexpensive.

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1989 420 SEL