Problems with 2004 Lexus LS 430 ENGINE AND ENGINE COOLING

Our 2004 lexus ls430 has stalled (or died) 4 times (while driving) in six months, taken to lexus dealer 3 times, where they could not diagnose the problem. stalls occur after driving 30 to 40 minutes, could not restart immediately although starter cranked well. vehicle has less than 35,000 miles. could usually restart after 20 to 30 minutes. adequate level of fuel. battery was replaced and fuel pump shut-off relay was replaced, but it did not solve the problem. contacted lexus customer service in california, but they since it is out of warranty they could not help. according to dealer, fuel pump recall has been completed. we are a retired elderly couple and are afraid to drive it on freeways or congested streets for safety reasons. also we do not want to make expensive repairs, particularly if we are not sure it will solve the problem. also we are very much interested in any similar problems that have been reported and their solution. *tr

Unexplained random surges speed on the 2004 lexus ls 430.*mr the consumer noticed that the vehicle rmps' were high when the vehicle was started cold (40 degrees) then once the vehicle warm up the rpm's decreased. when starting the vehicle during warmer temperature the consumer notice that the rpm's surged from high to low. the consumer brought this to the attention of the dealer and manufacturer. the dealer was unable to rectify or modify the problem and the manufacturer indicated that this may be a normal condition. *nm the consumer stated one of the most troublesome elements of electronic systems is wring connectors. wiring device failures are often intermittent, potentially masking the problem until circumstances contrive to produce a dangerous situation. the consumer was giving his opinion about the toyota acceleration problem. updated 02/23/10