Transmission problem
2003 Dodge Caravan 6 cyl Two Wheel Drive Automatic 91000k miles
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I purchased the dodge grand caravan when it had 66000km from the dealer. Soon after noticed erratic gear shifting. Took it back to dealer, they changed solenoid assembly (under warrandy)and said problem should be fixed. Soon after same thing happened but now it only happened when going into first gear. After that smooth ride. Instead of taking to dealer, I wanted another opinion, so took to an AutoPro mechanic. He said they did not reset the codes after putting new solenoid. So they reset the codes, but soon after same problem. I took it to another dodge dealer to get another opinion. They said no error codes show up, transmission is good. Need to change trans fluid, did that. Changed coolant fluid. Still the same problem. I also recently noticed that when AC is turned on, problem seems worse. Just today took it to my mechanic, he checked it on his computer and came up with error code P0731. He changed the sparkplugs, sparkplug wires, and cleaned the throttle body. Did not correct problem. Engine the transmission still under powertrain warranty 7 years/115000km. I have changed the oil regularly and followed owners manual maintainance guide for tune ups. Any suggestions, please help.