try running Amsoil p.i. run your tank till empty (doesnt have to be completely empty) and then fill up. Also power foam the throttle body (remove the intake and spray the Amsoil powerfoam into the throttle body while its running, turn off for about 10 minutes, then do some full throttle runs and watch the smoke). Ive had alot of customers who have had their catalytic converter, o2 sensor and other emission related problems cured with these products.

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Do your car and move up to Amsoil.