You don't. It's all controlled by the ECM and it has no distributor to adjust.
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who can flash 1998 chevy cavailer computer?
Yes without a doubt.
A 1998 Chevy Camaro uses R134a.
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Before 1998 - no. 1998 and after - yes.
no, 1998 is a year of its own, you will need a 98 trans