In June 06, I took my 2006 Nissan 350Z for service. I have the Nissan service package. The tech initially refused to accept the plan then with proper documentation - they credited the service. July 06, returned to Nissan for issues with rust on my hood, non-flush gas door and oil change. Was told over the phone the rust was from 'fall out' not covered under warranty and when compared to other 350's the fuel door was consistent in design. About 10 minutes later, I received another call to inform me that a new fuel door was order. They were unable to explain the reason behind ordering a new door. When I picked up my car, the service indicator sticker was not inside. My tires were not reset (issue indicator light was still illuminated) and there were no visible signs where they felt or closely examined the 'fall out' rust (car was dirty - no prints visible). On August 3rd, the Service Engine Light came on. On August 4th, the car was returned to Universal Nissan, where we were informed not only had my fuel door been in for two weeks but they no contact information on file for my account. Mind you - the car had been for service TWICE and on both occasions I was called. The Service Director reassured the rust was fall out and had a tech buff a small spot out as proof. He also instructed that the Service Engine Light was a 99.9% result of the emissions sensor caused by not turning the gas cap tight enough. It would take approx. 30 key turns to build pressure back up and the senor would auto correct causing the light to go off. The car was never checked, placed on any kind of diagnostic system to ensure that truly was the problem. Today, upon accelerating onto the highway in rush hour traffic, the car completely shut down. It was a fight to get the car onto the shoulder. Over 100 miles from home and the Universal Nissan dealer, I was able to contact a deal in Wesley Chapel Florida to service my car. He informed us the 'Throttle Body' was bad and was covered under warranty. When I called to cancel today's install of my new fuel door, I informed the Sales Director that we are unable to bring the car in because we are stranded, I was highly upset at the level of service and lack of willingness to better assess a problem that was obviously more severe than a sensor issue. I was informed that warranty service was only completed Monday through Friday and currently there is a three day wait for service. His attitude and lack of professionalism should be known and a complaint has been filed with regard to both service quality and customer treatment with Nissan Corporate. A car is an investment. Service is critical and finding a trusting dealership is important. I am highly disturbed with several issues currently underway at Universal Nissan and would like for others to take caution if Universal Nissan is their service provider.