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My brother was a cop in Round Rock, Texas and we just had this discussion last week. I don't know the laws Commiefornia but he said sound is subjective and in all his years on patrol, he was never issued a decibel meter.

is there a sound clip I'm missing?

So... borrowed a buddy's scanner and got a P2251 code and this while the car was running. I actually had to replace the downstreams 2 years ago from driving in some crazy downpour. So is this telling me just that one O2 sensor is bad? I'm going to replace both but just curious

Thanks... yeah it idles fines, just that jerking/ surging in 6th gear going 65-70 driving me bananas. I'll check all of those mentioned above and report back. Thanks for the help everyone

Wooo, that does sound like a lot but I agree at not throwing parts at it. Question if you or anyone else knows; should the vacuum stand steady at idle? Or should there be some fluctuation? At idle the car's vacuum is jumping from 21.3-21.7 (after it's at operating temperature) Is that normal?

The stock tune won't work with the cold air intake I have. And like I said before, everything has been great for at least 4 years without an issue. I do have a PBD tune that I may try to see if that helps.

Sorry... Cold air intake Long tube headers High Flow Cats Lund tune I've had all of this on for about 3-4 years and this issue just started about 2 months ago.

So I have a 2017 Mustang Gt., with 36,000 miles. When I'm in 6th gear at cruising speeds, the car seems to "surge" off and on, kind of difficult to explain. Only in 6th gear though. I thought it was the fuel injectors, which I changed but it's doing the same thing. I've checked for vacuum leaks...