greekrock

Thanks for the help and the fast replies!!

I bought a used 04 gs430 about 4 months ago. It has 44k miles on it now, i've had the 45k service done also. When my car first starts, moreso in the morning, it really hesitates bad. It is really noticable when the weather is cool and motor is cold. I took it for service and had them do he 45k service because of the hesitation and they said the spark plugs needed to be changed and that I should only put brand name gas in the engine which I do. I said I can't speak for the previous owner thou. Well the problem isn't fixed and I took the car in to get checked again and the tech couldn't duplicate the problem of course it was 100 degrees and I told him it wouldnt do it then. He said the V8 has these issues and that is just something I should get used to. Well of course that didn't make sense to me. After the car is running for about 5 mins the car runs normal. I'm concerned because the warrenty is about to run out in about 5k thou. Please let me know if you have had this problem and hopefully how it was resolved. Any help would be great!!