12-15-2016, 06:56 AM
Join Date: Jan 2011
Did all the spark plugs look the same? If you have headers you can use a squirt bottle of water and squirt each cylinder and see if any are cooler than the rest indicating it not firing. Compression check would eliminate a mechanical problem. Really not familiar with the newer mds models. But sounds to me you have a cylinder not firing. If you can determine if it is one of the cylinders that deactivates it could be a failed lifter. Good luck..
2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...
1956 Jeep Pickup Hemi powered "Street Rod project"
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Current 60' PB 1.351 (2019) mechanical issue for 1/4m
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Support vehicle- 2007 QC G56 4x4 diesel