ok so i took my stock exhaust off, put on shorty headers with true duals to x pipe to twin mufflers, the headers i bought came with a threaded hole right at the collectors so i extended the wires on the o2 sensor to this hole, heres my problems, truck ran fine last night after exhaust job, but today going down road engine light comes on, so i pull over and pop hood, my water hose going to the top of the engine is sucking shut then back open then back shut like its out of water so i added some water, got back on road engine light came back on, my temp guage stays at 180 but only goes up to 190 which is nothing, also my coolant water is dark looking like its full of rust, is my coolant system clogged somewhere? when im doing 60 with cruise control truck has a slight, very slight like loss of power then back to normal about every 5 minutes, whats up??????? did i mix my wires up for the o2 sensor when i extended it and my 02 sensor is not working right or is my coolant system dirty or just both at the same time?????? help please is it ok that i put my o2 sensor here???