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Here's what I have tried so far: 1. Swapped in a stock tune - flat spot remained the same 2. Replaced/swapped inlet manifold w 2018 manifold - no change (swapping the inlet manifold was mostly to replace the IMRC in case it was interfering. Apparently not) I've struck out: - spark plugs...

Hi all. I've been scouring the web and this site, but I can't for the life of me find any info on how to reduce the revs on the first 20 seconds of my cold startup... I have headers, a cross pipe and a 2.5" exhaust which I think sounds fantastic (although at 5am the neighbours don't - and I...