My truck has recently been running rough at idle and it smokes a lot at idle, it’s a constant gray cloud. It drives great, has power, no blow by. Is this something to worry about, should I get the balance rates tested? Truck has about 50k miles on rebuilt engine bored 40 over, I replaced injectors about 40k miles ago, stock intake, 4inch exhaust, edge CTS on level 4. I just ran Howe’s fuel treatment through the last 3 tanks and the rough idle is much better now(only does it maybe 30% of the time) but still a lot of smoke. I changed fuel and air filter 3k miles ago.