Lexmex

I am not a fan of everyone of this group's products nor are they the best in every category, but this one has struck me has pretty outstanding,

Liqui Moly Ventil Sauber or in the U.S. Lubro Moly Valve Clean

http://www.liqui-moly.de/liquimoly/p...cument&land=DE

I don't really consider this a fuel injector cleaner, but more of a gas additive (and in my view gas additives are more potent things). While it will go straight from your gas tank and through the combustion cycle, there is one particular thing I like this product. For a lot of us with older vehicles and RX300s have been out of production for over a decade, we will or are inevitably going to run into issues with oil seeping into the combustion chamber whether around piston rings or normally via crankcase ventilation. That's going to build up a lot of gunk in the combustion chamber and that's not easy to get off and a lot of fuel injector cleaners may not do a sufficient enough job on the first go around.

I got this at Napa Auto Parts for just under $4 a bottle (it's a bit more on Amazon), but after one tank, the engine ran much smoother and quieter than at any time since I started modifying the exhaust and intake.

Hatchman

I usually use Seafoam, but may give this a try.