Auto Zone bought a 2001 dodge dakota crew cab last May 2013.went home then it has check engine.return it beck to the dealer.and they didnt repair it.one more problem came up,leak on power stearing. Reno Nevada

I bought a 2001 Dodge Dakota 4wd crew cab last May 2013 at one of the car dealer here in Reno Nv,Car Zone with a cost of $9,995.00 window price.I put a down payment of $2,000.00.when I went home and got the truck,I notticed that there is a engine check light.I brought back the truck on the dealer,(I dont know about fixing car)to fix it,what they just did is put something a tool .and what I know they just reset it.I feel happy on that time cause check engine's gone on that time.when I went home the check engine went back and not only that,it came up also that there is a power stearing fluid leaking.some power window also are not working.I went to Autozone and let the carparts store scan my truck and it came up that the truck has a problem with ECM-PCM computer module.I went back again to the dealer and trying to trade it in cause anyway they wont repair it.but they turn me down not to trade it in.so I ask the dealer if thay can get me a ECM and im going to pay it with them and after that they gave me an appointment to get that parts,and after that I went back again to the dealer to get the parts that we talk about.and they cannot provide me that parts instead the dealer is so mean and rude that almost jump on me.Im so mad at that time,but instead of making action,I just went home feeling mad and feeling riftoff.now I dont know what to do.this truck is on my wifes name.