Car works great but sometimes at a light it will idle rough and then normal also sometimes when you accelerate it goes lazy then speed up

What is your question?

I own an1998 infiniti qx4 .car works great but lately when I stop at a light it will idle rough then normal also sometimes when you accelerate it will go lazy then speeds up.I recently changed the water pump and the valve cover seals.Someone told me that the mass airflow sensor may need to be cleaned.please let me know what you think.

What makes this problem better or worse?

Nothing really

How long has your 1998 INFINITI QX4 had this problem?

About 3 weeks