Periodic Hesitation in acceleration

My 02 forerunner will hesitate periodically when accelerating. It may only do this a few times a day and sometimes more frequent. I have replaced the fuel pump and fuel filter and upon replacement of parts, it did fine for a short time but started doing the same thing. The hesitation is only for a few seconds whether starting off or on interstate. Any suggestions will be greatly appreciated ! Thanks

 

Check your plug wires had one that wear out and for some reason would do the samething your saying only under load would it start to hesitate drove me crazy

 

A little more information would help.

What motor?
What transmission?
When did it start?
How many miles?
Check engine light on?
Maintenance history?
Modifications?

 

when i had a hesitation issue, it turned out to be a gunked up MAF sensor... when you clean it, make sure to reset the truck by disconnecting the battery before cleaning...