need help

[Monk654321]

I have an 03 1500 4.7 4x4, 5 speed, When you are in neural and moving the RPM bounces between 400 and 1100, when you come to a stop in will sit at 600 when your in gear it is totally fine, I have replaced the MAF, TPS, IAC sensors with no affect, any input would be appreciated.

 

[TERRY G ABNEY]

I have an 03 1500 4.7 4x4, 5 speed, When you are in neural and moving the RPM bounces between 400 and 1100, when you come to a stop in will sit at 600 when your in gear it is totally fine, I have replaced the MAF, TPS, IAC sensors with no affect, any input would be appreciated.

vacuum leak or faulty idle air control valve are a possible cause ,,