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Never mind. I missed the 540 post. Sounds like a vacuum leak. I had issues like this right after I did my 3.4 also. I just had leaks in the intake system and on the intake manifolds. I hope you get it all ironed out.
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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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