I have a 2001 IS300 that I bought new in Torrance in November 2000, and now showing 89,000 miles. I drive the car with the shifter buttons, and the engine is solid, and has always performed superbly, until recently when it began stalling in 3rd & 4th gear when it revs up to 3800. At that point it doesn't produce any additional power, and the curve just seems to flatten and remain flat.

I haven't tried to flog it beyond 3800, and the car performs otherwise beautifully in 5th gear, where I seldom get close to 3800rpm. I use Marvel Mystery Oil in the gas to keep the injectors cleaned out, and the car is a sweet runner until the higher rpm range. The engine is otherwise completely stock. If anybody has experienced something of this type, and has remedied the problem I would very much appreciate some help with this. Thanks, rseifer@earthlink.net

 

Check fuel filter

 

No check engine light?

​​​​​cleaned the maf sensor? Changed plugs? Cleaned/changed air filter? Cleaned throttle body?
probably one of those things.

V.

 

Thanks. It was the MAF sensor. Quick spray with cleaner, and a new filter, and the car is running just as sweet as brand new.