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Discussion Starter #1
When sitting at idle I have vacuum that fluctuates between -8.6 and -9.1 and I get a pretty consistent stumble. Car is a 19 STI with 5100 miles on it.

I don't know if it's new or I am just now noticing it. I feel like I remember it being pretty rock solid.

Thoughts? Is this just a product of being in S#?

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My 18 does it with the a/c on. Pretty pronounced stumble. Sometimes I use S# with the a/c on to compensate for the power loss, but didn't associate S# mode with the stumble. I will try it in S and S# to see what happens and post again
 

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My 2017 does the same thing - when the A/C compressor kicks on. If you have an accessport you can adjust the idle RPM when the air conditioning is on. I bumped mine up about 200 revs and it's a bit better - not as much of a drop.
 

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Discussion Starter #5
Yeah, it was definitely the AC. Thanks, guys!

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go Cobb Stage 1+,
i just did last week , at roughly 3000miles.
i realy runs better on all levels.
 
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