Got a problem with a '97 landruiser. A couple of months ago, it starting hesitating while accelerating. Sometimes in first gear, sometimes second, etc. It doesn't do it every time I hit the gas, and even when it does, it is only for a couple of seconds. I can't figure out what's up with it.
The fuel filter has been replaced, fuel system cleaner has been run through, as well as seafoam. What should I try next?

 

Plugs and wires