general problems of the 2004 Kia Motor Optima

I have been taking my car to kia of orange park in jacksonville, florida for the past several months because of issues with stalling and hestitation at start and the car has stopped on my while in gear with my foot on the brake (three or four times). Each and every time I take it to the dealership they seem to say the vehicle will not duplicate the concerns I am having. I have been afraid to go a long distance with the car because of these issues. I recently switched to southside kia in jacksonville, florida and they convinced me the car was fixed after replacing sparks plus, fuel pump, gas tank valve, and on one ocassion they found the tps sensor loose from the previous kia dealership doing a throttle body service. I am very dissatisfied with kia right about now and have not been able to get any help.

Purchased a brand new 2004 kia Optima from the dealer on 12/09/2004. The cruise control has not been working since the first day it was driven out of the dealer's lot. What's more, three weeks into ownership of the vehicle, it began to exhibit intermittent, rough idling problems. The problem is not noticeable on cold starts, but after it has been driven for about 35 minutes or so and the engine has warmed up and reached a certain temperature, it will begin to make rocking-jerky-thrusting like movements. It can be felt, as if, the car is either choking or trying to accellerate while waiting at a red traffic light. As for the cruise control, the module was ordered on its first visit, the module was defective and reordered on its second visit, the module was installed on its third visit, and the dealer stated that it needed a switch for the cruise to work. Three months later, the cruise control is still inoperable. As for the idling problems, it could not be verified on its first visit. It was verified and reproduced on its second visit, and the car stayed for 2 and 1/2 weeks with the dealer to replace a mass airflow sensor. Picked up the car only to find out that it still has the same idling problems. It went back to the dealer 5 days later, and they claimed that the problem "could not be detected. " two days after its last visit on 02/02/2005, the dealer delivered the car with significant damage on the driver side front and passenger doors. The car got in an accident while it was in the dealer's care, and they promised in writing to fix it. 1 and 1/2 months later, the promised was not fulfilled, so I picked up the car and took it to another shop. My insurance paid for the cost, less $500 deductible. Where the dealer failed in 1. 5 months to fix the damage, another shop succeeded in just 6 days! the doors are fixed, but the on-going problems on the car still remain. Three months of ownership of a supposedly "brand new" car, and it behaves like a clunker.