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Discussion Starter · #1 ·
2008 LTZ with a 3.9, 112k on the miles.

While idling around 600rpm, the RPMs flutter between 50-75 RPMs. No codes, no rough idle. Acceleration on the car is just below what I would categorize as normal. Vehicle sat for all of 2020 without being cranked one time, any suggestions on what to clean/ check for?
 

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You might want to check for a mouse nest in the engine compartment. Check inside the air intake and filter area. Also look for any chewed wires or hoses. Those little bastards love to chew wires and hoses.
 

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2008 LTZ with a 3.9, 112k on the miles.

While idling around 600rpm, the RPMs flutter between 50-75 RPMs. No codes, no rough idle. Acceleration on the car is just below what I would categorize as normal. Vehicle sat for all of 2020 without being cranked one time, any suggestions on what to clean/ check for?


Inspect and clean the inside of the throttle body, including the edge of the butterfly valve.

At idle, a dirty throttle body bore will not permit enough air flow to ensure a stable idle. When the idle speed drops slightly due to insufficient air flow, the car’s computer system attempts to correct the idle by increasing it (thus the RPS flutter).

Also ensure all fasteners are tight on the air intake hose - and there are no splits or tears in it.
 

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Discussion Starter · #4 ·
Inspect and clean the inside of the throttle body, including the edge of the butterfly valve.

At idle, a dirty throttle body bore will not permit enough air flow to ensure a stable idle. When the idle speed drops slightly due to insufficient air flow, the car’s computer system attempts to correct the idle by increasing it (thus the RPS flutter).

Also ensure all fasteners are tight on the air intake hose - and there are no splits or tears in it.
Cleaned the throttle body, issue resolved. Thanks!
 
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