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Broken Tachometer, help.

Metal Links

Metal Links

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I just recently purchased a 2004 Pontiac Grand Prix gt, 66K miles. A few days ago I noticed my tacho was at 1k when the car was off, and would randomly slowly go back down to zero. It seems to respond when I hit the gas but then it starts falling when I maintain speed.

How would I fix this and how concerned should I be?
 


It seems to get stuck at 1000 rpm when falling. The best description for its movement is floaty or bouncy... It stalled once when I first started it, I heard it start and then it just stopped. Almost like it was not getting enough fuel. The stalling only seems to happen when the car is warm. There is also a strong smell of gas/exhaust when I idle in the morning to de-ice the car.
 
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Time to remove and clean the throttle body. They get carboned up on the back of the butterfly and cause issues.

From there, it may be time to suspect a crankshaft position sensor.
 
I cleaned the throttle body. the back was coated in carbon and the front had white-ish specks on it....almost looked like salt deposits. I havn't notice the issues yet, I will keep you guys updated.
 
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