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Afc is to add or remove fuel. It works by tricking the mass air into thinking it's getting less or more air. This is helpful to keep your air:fuel ratios safe. You need the wide band 02 sensor and gauge to monitor ratio. Best to have it tuned by someone who is good with this stuff. Afc stands for air fuel controller. My motor went because I wasn't monitoring it at the time. I put in my afc and gauge when I did my 3.4 swap. I used to use these simple piggy back systems back when I had turbo cars.
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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