Question about 2000 Pontiac Firebird

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Idles rough when coasting

I have a 2000 firebird with the 3800II v6 engine and 5 speed manual transmission. It has the 'drive by wire' throttle body. I like to do a lot of coasting down hills instead of keeping it in gear. When the engine is warm and coasting in neutral, the engine will drop the idle to normal, then shortly after drop real low, almost until it stalls, rev itself up and then do it again. This happens repeatedly until i come to a complete stop, or i play with the clutch pedal. When this happens, the engine looses oil pressure for a seccond. It still happens after i cleaned out the throttle body with cleaner and bypassed the clutch start switch. It doesn't happen when the car is stopped or cold. Can someone please help me?

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Have you checked all the vacuum pipes around the top of the engine.?
It`s not losing oil pressure, it`s just about to stall when the oil light comes on.
Listen for a hissing noise under the hood.
Vacuum leaks can cause real problems with the inlet manifold pressures.
Good luck.

Posted on Jan 31, 2009

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Posted on Jan 02, 2017

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