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I did experience that when the hole I made was too small, around 7/32 or so. Also, the engine came *very* close to stalling out when I turned on A/C and the compressor came on. Thats when I enlarged the hole to where it is now.. 9/32 or just a *touch* bigger...(from smoothing out the sharp edges with a file)
The way mine is now, there is no drastic RPM dive, no erratic operation.
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2003 Mustang Mach 1
Torch Red, 5-Speed
w/ IUP
Steeda Tri-Ax
Steeda Sport Springs
UPR Adjustable LCA's
Offset Urethane Rack Bushings
Maximum Motorsports Full Length SFC's
Ford Racing 4.10 Ring/Pinion
JLT CAI
Ported/Polished TB/Upper Intake
PHP Intake Spacer
NGK TR6 Plugs, Gapped @ .050
MAC O/R Prochamber
Borla Stinger Exhaust
SCT Custom Tune
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