2003 lexus is300 use to ride good all of a sudden car has random shakes , it feels like a loss of power , rpms go up high .. Its like timing is off and misfires.. Everyone has told me something diffrent from timing belt , ignition coils,
C. converter , its really starting to be a pain .. Anyone had similar problem? Any help , ideas..

When you say the RPM's go up high, are you talking about transmission slippage? As in, they go up high without acceleration?