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Discussion Starter · #1 ·
i own a 03 svt focus, 91000 miles, no mods. when i start sometimes it severly lacks in pickup in first and second gear, infact the engine seams to steadily loose power. generally when i shift to third the problem goes away, i can stop and go in first in second like normal. maybe vacuum leak? input is appriciated
 

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Discussion Starter · #4 ·
yes it is for the cat running below efficiency (i forget the code) but that has been on for a while with no issue, i believe that to be because my front o2 sensor is a bosch and the rear is OEM
 
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