do what they say, read your codes, if you are able to, read the voltages of your upstream and downstream o2 sensors, with the eliminators, you should see roughly a 5 volt signal, the originals like to hover around that area, if you have other than that voltage or a fluctuating voltage, look for vacuum leaks, providing you have no other codes.. you upstreams should be varying from .1 volt to .8 volts and rapidly changing hot.. if can get the codes, e-mail me, i do work at an svt dealership.... hope this helps
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