Automatic Transmission Torque Converter Problems of Infiniti I35

I have had two transmissions in this 2002 Infiniti I35 and now may have to have the third. Summer of 2011 I experienced intermittent issues with the engine racing and the transmission apparently disengaging, with no power to the wheels. First time I took it to the dealer they couldn't detect any problems as there was no service engine soon warning on the dash board so their computer couldn't detect a problem. Happened again and the technician told me not to turn the ignition off when I got to the shop but to let the engine keep running. He drove the car back to the shop and hooked it up to the computer. The problem was diagnosed as the torque converter clutch function code along with p0720 and p1574, check engine light concer – ip006, (failing), and I was told I had to have both a torque converter and a transmission. The price for a new one was too high and I opted for a used torque converter/transmission and now, 5/2/2012, less than a year later I am having the same problem as before. Several times this loss of power to the wheels has happened when pulling into traffic and is extremely dangerous. Another issue is the suspension and steering. I have had to replace the struts because the front end would vibrate veer left and right and lose some control over the steering when driving over rough pavement. Even after strut replacement the issue still persists. August of 2011 around the same time transmission was replaced I had to replace the radiator which burst at a seam. It was replaced before the transmission and at a different shop, and not at the dealer's shop.

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1) traveling at high speeds 50-60 mph for a considerable time frame, one-two hours. On a highway with stop lights-when trying to stop, my Infiniti I35 (yr. 2002) accelerates while I am trying to brake. The car lurches foward with the engine going from 1500 rpm to 7000 rpms. The incident repeated itself later on 8/16. We were traveling from baltimore to virgina on route 50--good road accomodating high speeds but has lights as one passes through eastern shore towns. The car was towed to infinite's nearest dealership in va beach. According to that dealer's shop, no error messages or issues were reported per their computerized testing. According to them, their road tests , two tests, a drive for 15 minutes and the other was to get the car's speed up to 80 mph on an in-shop rolling machine, revealed no errors. My contacting Infiniti's national consumer affairs office resulted in no tangible assistance. The dealer drove the car to baltimore, 8/20/04 and reported no problems. Interstate 95 was used (its not the same as route 50 with high speeds and frequent, quick(er) stops. The car is not working and needs to be corrected; it is dangerous. Infiniti will not proceed since computerized analysis reports no error messages. In June, 2004, we had taken the car to jba of ellicott city complaining that the car was demonstrating problems: at stop signs, on occasion, the car would not move forward, the engine would race, then the car would lunge forward. That dealership again commented that there was no problem registering on its computer testing, therefore, no problem. It seems that the firm's testing methodology isn't either comprehensive enough or limited to only computer analysis. The car has a defect and this firm can't or won't reach out of the box to try and solve it, excusing any effort on their part because their computer results disclose no "error message".