I just bought this beautiful car and when I start it cold, the engine will race to 2500+ RPM's until the car is warm. Then the idle returns to normal. No trouble codes present.
I have connected a Snap-On scan tool and it shows no abnormalities. TPS voltage is normal. I replaced the IAC; no change.
I was a mechanic for 10+ years and never saw anything like this on a 3800 V6. I know this cannot be normal. I had a 92 Lumina Z34 that had the same problem and it ended up being the intake manifold gaskets.
Any help would be much appreciated. THANKS!
Rich
1990 Buick Riviera
2000 Buick Regal
1984 Chevrolet Conversion Van
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