Ok, heres the problem guys. 1993 es300. 180k miles. Under hard accelleration from a complete stop, I get a total loss of power. Engine idles fine, does not overheat. Looked at spark plugs, and they appeared to be in good condition, but I can't be positive. They were replaced recently. If the car is in neutral, and I hit the gas hard, the engine runs fine, gets up to high rpms very quickly, with no loss of power. Recently had the complete fuel system cleaned, where they dump the chemicals into the gas tank and i believe the throttle body. Still no fix. Stumped...any suggestions would be great. It seems like there is a lot of knowledge floating around this forum. Problem has persisted for a long time, maybe 50k miles or so. but it has gotten to the point where now, if I am crusing around 65 or 70, and stomp on the gas hard to pass on the highway, I am experiencing a slight loss of power or hesitation, which I never experienced before. It sounds like a ignition problem for the engine is not getting enough fuel or air...but i cannot be sure and lexus maintainence can be pricey. thanks for the help guys.