Hi, I have a Lexus RX 300 2003 model that has no acceleration after ignition.

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Hi, I have a Lexus RX 300 2003 model that has no acceleration after ignition and when in gear. Only the reverse work without issues, however while in drive, I experience no power in acceleration only until the car has warmed up and after at least 20 minutes of waiting. The acceleration may not work even after warm up and so I have to rev the engine for a couple of minutes before it works. I have replaced the oxygen sensor heater control some and the check engine light went off however the issue still persists. What other measure could cause such an issue. Am writing all the way from Kenya therefore I may not be able to find a local dealer on your site. I would rely on your advice to guide the mechanics here as well as ensure the right process is followed. I hope you can help me on this issue. Kind regards