Supercharged Roush Mustang Stutters, Stalls Right After Shifting Gears And Giving It Gas

nuacr0s

New Member
Feb 21, 2017
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I have a problem with my 2012 Roush Mustang. I recently upgraded everything along the air flow path, injectors and new custom tune, and now it stalls when I shift gears at WOT and it dies or has erratic idle after I shift from gear to neutral while cruising

I’ve blown some smoke up the air intake tube, but could not find any vacuum leaks, maybe vacuum only leaks under engine load, while I am driving, because cat temps run really high when I give it gas, not sure

It was fine before the air flow and injectors upgrade. Here is a list of what I changed:

Throttle body: from stock ford 60mm twin to VMP 67mm twin

Supercharger elbow: from stock roush to VMP high flow elbow (ported)

Intake tube: from roush 90mm to JLT 95mm tube

Injectors: from ford racing 47lb to injector dynamics 1000’s 98lb injectors

Coil packs: from ford stock to granatelli extreme coil packs

Fuel type: from 93 to 98 octane

MAF sensor is clean

Installed 2 oil catch cans: one for the engine manifold and one for the air intake tube

Everything else is stock

New Tune: XP racing tune

Dyno results: 640 rwhp and 530lb/ft rwt

I’ve not seen any posts linking acceleration stuttering to any of the upgrades above. Does anybody have an idea or a lead I can follow to try and get to the root of this issue?
 
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