Hard shutter
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Hard shutter
Need help with 06 F250 4x4 6.0L 201,500 miles. Stock except 4 MBRP exhaust and AFE air. Vehicle shutters going up long grades at about 75 MPH and not pulling any load. No codes and no lites on dash flash. Have had new turbo, EGR, fuel injectors, bullet proof EGR cooler, stock oil cooler replaced and a ficum. All around or before 186,000. Still does the shutter. Mechanic cannot duplicate and cannot figure it out. Any help is appreciated
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