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2004 ford f150 pinging

My service light came on, I took it to the dealership and they told me the imrc had to be replaced because it had a vaccum leak, it has 48.000 miles, but I have an extended warranty. they did the work but now my truck pings. they said the timing is right according to the computer and maybe I had bad gas in it. I have ran 2 ttanks of high octane gas from chevron through it and it still pings, I have taken it back twice to the dealership and he said all they can do is ****** the octane level in it. I'm going to take it back for this in a few days to be done. Does this sound right?

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