Blowing blue smoke
Hi All I just came back from a trip upstate ny about 200 miles each way. When I got off the expressway the truck started running funny. I was at idle for maybe 5 mins then while getting back on road I hit the pedal to blow her out a bit. The smoke started & then she sounded like she was knocking, I thgrew in neutral & it kinda smoothed out. But I had about a 5 mile ride home so I would throw in neutral it the traffic lights. This morning she started up lotta blue smoke, power is like a flat spot when accelerating & smoke is not going away. codes P0341 & P0674. There is blow back coming out oil fill tube when she is at idle. Any Ideas ? have a monitor & ect & eot were probably within 8 degrees during entire trip, even after trouble started.