My G35 did this every time I swapped intake manifolds or installed a plenum spacer.. Did exactly what you described. It would eventually go away after a day or two. I believe it was the ECU learning the new mod I had installed.
Could this be a factor for your car and it's mods?
EDIT: Just for reference I've went through 2 plenum spacers, and 3 different intake manifolds.
Last edited by ninous26; 10-09-2010 at 02:25 PM.
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