Engine Stumbs at Exceleration

Any thoughts would be appreciated. When cold engine runs fine for about 1 minute. After that it stumbles between 5 and 20 MPH, then fine thru high speed. Has new iridium plugs all new coils. 2005 4.0 V6-Four Wheel Drive
Thanks, Don

 

No CEL Codes? Clean the MAF Sensor and the Throttle body for starters and see if that helps.

 

Thanks - No codes at this time but I was getting misfire codes until the plugs and coils were replaced. Cleaned the MAF and throttle body. A little better but stil there.

 

Was it running fine without the iridium plugs? Toyota very specifically states that copper plugs should be used for the 1GR-FE (V6 4.0).

 

No but if I should I will install the cooper plugs. Thanks