That high idle (even though the engine is warm) and ~2000rpm limit can be caused if the ECU detects an issue and goes into limp mode. Any CEL when this happened?
I had this exact behavior happen to my car when I took off the manifold to clean it. It turned out one of the throttle bodies had a lose harness. I just plugged it back properly and the engine instantly went out of limp mode and idled/ran properly. I also had a CEL which helped pinpoint the issue when I scanned the code.
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08 G35 5AT Sedan | Stillen CBE | Invidia HFC | Injen CAI | Uprev Tune | Akebono BBK | Tanabe Coilovers | Hotchkis Sway Bars | GTSpec FSB | Black Headlights & Grille | Volk GT-F Wheels | Hankook V12 Evo Tires
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