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Discussion Starter #1
Hey guys,

Need some help on a idle problem that started out of no where, my car has been sputtering lately during cold starts and idle (kinda of sounds like a missfire), so i asked my tuner to see if he can take a look what could be wrong with it and he said I'm getting insufficient amount of vacuum(-12"/ psi) on idle which I should be getting -22"/psi. I'm starting to think it can either be a MAF issue or if my timing jumped a tooth.. But i'm not getting any CEL's at all.

Any help will be greatly appreciated!
 

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Discussion Starter #2
Update even though nobody has an input..

Map sensor is fine, timing is good, spark plugs are fine.

Cant think of anything else.. Looking back at my old datalogs when I wasn't sputtering i was pulling vacuum at -19"/psi, why out of nowhere would it drop to 12"/psi thru -15"/psi?
 

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Discussion Starter #3
Bump anybody know if an exhaust or cracked header causes this or maybe even a bad primary o2 sensor might be going bad?
 
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