Good day , I have RX300 model 2001 , when I start engine cool it run but if I push the gasoline bottom and rpm reah cycle 3000 it start make misfire tell the engine warm so I can move and run normall till I stop the car and the engine cooled again . It will make the problem again

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I Have lexus Rx300 model 2001 , when I start the engine and been cool make misfire if the RPM reach 3000 cycle (Cutoff) but when the engine warm after 3 minute its work OK .

Are you saying it misfires only when it's cold and that once it warms up, the misfire goes away? Is your check engine light on? Are you noticing the misfire at idle when stepping on the gas, or as you're driving down the road?

. Check for codes.

. Replace spark plugs with the exact brand and plug no. that came in the car. Coat porcelein and main electrode with dielectric grease.

. Replace the Engine Coolant Temperature (ECT) Sensor, which affects fuel injector pulse width. The ECT Sensor is a temperature dependent resistor (thermistor), whose resistance decreases as the engine coolant temperature increases. It provides a richer mixture when cold, leaner mixture when hot. They become corroded, due to not changing the coolant frequently enough, flood the engine, and waste a tremendous amount of fuel.

. Replace any problem coil-on-plug (COP). Ensure COPs are properly installed, with coil electrode centered over the spark plug.