Suspension Related Problems of the 2001 Nissan Quest

Suspension problem

Vibration felt in front end and pulling to left. Steering wheel shook and was difficult to control over 55 mph. Serviced several times at dealer. Mechanic could not reproduce the problem. Stated it could be the tires. Had tires aligned and rotated, no change. Bought new tires, still no change. Foul odor smells like sulfur. Dealer stated it is from the cheap gas purchased from military installation gas stations. Drove vehicle until almost empty then fill tank at shell station. Foul odor returned when fuel was at 1\2 tank. Hard start upon ignition sounds like metal rubbing against metal. Air conditioner very loud and noisy. Dealer found to be normal. Side window latch popped open when door closed and after hitting a bump. Sliding door stuck sometimes very difficult to open.