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I have a problem with my 2017 Mustang Gt non-pp with manual transmission So my car has been shutting off after changing into neutral from going relatively fast (80KM+). I'm not really sure if it's stalling or just shutting off. there is no jerk or anything I watch the rpm just drops to 0 and the car dies, all I know is I'm cruising, switch into neutral to Cruz to a stop, and the next thing I know I feel the car stiffen up since I lose the power steering cuz it shuts off. I then have to turn it back on which isn't an issue, it cranks right up and I keep on my way. any ideas on what is causing this? I have no CEL on the dash, but I check to see if I have any codes and find P0316 "(Engine Misfire Detected on Startup First 1000 Revolutions).” The car was starting and running fine before I installed the intake. ”I recently installed a gt350 stock air box with and coupler to adapt to my Stock throttle body and stock Intake manifold.
 

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Sounds like you might have a vacuum leak. Check all the intake connections.
 
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