Lumpy Idle

[zippityDu]

I’ve replaced o2 sensor, new air filter and cleaned iacv.

it jumps between 600-900 rpm’s like it’s cammed.

i noticed my lights were dimming as the rpm’s dropped.

any ideas on fixes?

[MrBurgundy]

Sounds like a classic vacuum leak.

I would start with a smoke test. Any un-metered air is going to throw the idle into an oscillation

[zippityDu]

Sounds like a classic vacuum leak.

I would start with a smoke test. Any un-metered air is going to throw the idle into an oscillation

that was what I was afraid of. Thanks for the help.