Stumble and leaning out

[carguy231]

I’m having an increasing stumble occurring mostly when cold, but lately even cruising on the freeway and on city streets…. It looks like the AFR is leaning out way out, dash gauge says "20"....

Any ideas?

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[MiamiGT350]

How old is the car? Any check engine lights or codes? Have you tried cleaning the MAF sensor in the intake?

https://shop.advanceautoparts.com/p/crc-mass-air-flow-sensor-cleaner-11-wt.-oz.-05110/7070079-p

 

[carguy231]

Car details in my signature. I'll try cleaning the MAF. I also forgot to check the most basic thing: air filter in the Airraid - it has worked itself loose in the past. Thanks.

 

[MiamiGT350]

You might also want to clean up the throttle body while you are at it and ensure the blade is not sticking open.

 

[SheepDog]

Vacuum leak.

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