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Hi, car's basically BPU, DP, dropin air filter, BCC, and just installed EVC4 running TTC. I noticed that my car idles rough now even after trying to adjust the idle. What could be causing rough idle? I don't think I have a boost leak cuz I can boost to 17psi, haven't tried higher, and vacuum is pretty steady at 20psi.
 

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What type of spark plugs do you have? If you got the ever popular NGK 3330's, the rough idle is normal...Darshana S...
 
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