I noticed my truck has been running noticeably quieter lately so I checked Balance rates and the #4 cylinder values have dropped significantly.

Previous values at 33Kmi
Cyl Park Drive
#1 -1.5 -2.0
#2 -1.6 -2.6
#3 -0.1 +3.2
#4 +1.8 +5.3
#5 -1.0 -2.6
#6 -1.6 -3.1
#7 -2.0 -2.0
#8 -1.1 -2.0

Latest values at 35 kmi
Cyl Park Drive
#1 -1.5 -1.9
#2 -1.8 -2.5
#3 -0.9 +3.2
#4 -.3 +.35
#5 -1.1 -2.1
#6 -.8 - .94
#7 -1.0 -1.4
#8 -.9 -1.3

For the last few months I’ve been running a double dose of Stanadyne performance formula and 3-4 oz of FPPF Injector Cleaner (per 15 gal)… Could this be helping keep the injectors clean?? Fuel knock at cold idle and between 1500-1800 rpm is also greatly reduced.

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