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Hey guys any guess as to why my 81 D150 /6 will not hit 180*? I thought maybe the thermostat was stuck open so I replaced it last night with a new 180* and it still doesnt make it past 160* I let the damn thing sit in the drive way for atleast 30 min. last night after changing it and still didnt...

Hey guys I am in need of a little input. I just picked up an 81 truck with a /6 and the #6 cylinder is "missing". I have spark all the way to the plug. I pulled the plugs and swapped in new ones and thats when I noticed that #6 was fouled black. All the rest are nice and clean white. I them...