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That profec is fine... I mean it all really comes down to whether if you know how to wire it up, I really doubt you will have any big problems for it. Its just a boost controller, won't make your car fly or anything....
As per your problem with the SR, check your ignitors, check your injectors and check your FPR. Also check your spark plugs to see if they will tell you anything. Secondly during cold start the computer will automatically give it a leaner mixture so that the engine warms up faster. The spark plugs should tell you a lot on how your mixture is.
If you dunno how to read spark plugs, google it.... you can find something for sure. Good Luck
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