I've started experiencing some performance issues. On cold starts I'm getting some white smoke not voluminous but more than usual. It clears when the engine warms. While towing (trailer at 10,000 lbs) an incline I feel the engine bucking as if on a washboard. I back off and it quits. At cruse it runs fine, and idles with no anomalies. I'm also seeing an increase in temperature that is directly related to the rpm's.this is a new one that showed up on my most recent trip. I'm thinking injectors but am open to other possibilities. I have a few months before we take another trip and I want to solve this before I do something serious.
Thanks in advance.