My Chrystler Cirrus nightmare from JD Byrider

Well I got approved for a 2000 Chrystler Cirrus from JD Byrider in June 2007. Within the last 2 months I had to have my car towed 6 times. The first time was my spark plugs and wires..after 90 dollar tow they charged me 50 dollars for the job, after going home and looking at my extended warranty contract I signed I found out the parts were suppose to be covered..after bringing it to thier attention, they admitted it was a mistake and gave me 2 free oil changes..so fine i will take that..a week later my car stopped in the middle of a busy street in the middle of rush hour traffic. I had it towed again another 90 dollar job..after having my car for 3 days they said it was an auto relay shutdown and they fixed it for free..fine..drive it home everything seems fine, the next day on my way to work on 91 going into Connecticut and the car stops running again same thing..the check engine light comes on the car looses all power, and the word "no bus" came on the dash...again another 100 dollar tow this time, and they call me back saying it was the PCM..a part not covered in my warranty and said it was costly and not an easy part to get a hold of..after going 2 weeks without a car they billed me 600 dollars for the job..They also refused to help me with a rental and i missed 4 days out of work. I understand they are not normally responsible for rentals, but 2 weeks?? i mean a few days is one thing, but I work in another state than from where I live..I need a car to get back and forth to work..so they added the cost to my payments because i didnt have the cash for the repair, and my payment history with them was really good. so I was finally happy..got my car back and everything seemed fine..last night on a very busy 84E..The car did the same and died again!!!! Now isn't Chrystler responsible for parts and labor for more than 7 days?? After paying 180 dollars this time for towing they refused to give me back the money for towing even though technically its still thier fault that the part they claimed to fix went out a week later. Now I have to go another 2 weeks? and they said they still wont give me a rental and my job is threatning to fire me...damn what do I do?