it has the 5.9l 4x4 . symptom bad miss...
was running 65 on cruise controll and felt the miss going down the road it just happened.if u run 35-55 on o/drive it shakes ,35-55 no o/drive it shakes .in park @ idle and run rpm 750-2000 u feel it . figured i'd put tune up on it, but last tune up was 3-4 months ago. did tune plugs,wires,cap,rotor still misses run it to 75-80mph smooths out . put idle sensor ,o2 sensors,coil pack still a bad miss.Did compression test #1 145 #2 145 #3 105 #4 110 #5 128 #6 142 #7 128 #8 138 tested each cyl 3 times could b 3psi off ....plugs from tune up 3-4 months ago 7 clean burns no tarnish #1 had tarnish or discoloration.Plugs from tune up 2 days ago 7 clean burns no tarnish #1 had tarnish or discoloration. now I know that the cylinders psi needs help. I've pulled plugs and fired over all have spark going thru them. what would cause this truck to miss on just 1 cylinder ??????? I'm 3 days into this and stumped.
I know engine could use a rebuild , just don't get why I only miss on 1 cyl when five have bad compression. lmk please going into fuel system now. harmonick balencer seems fine not pushing belt off .