Still having a problem with my 99 4Runner?

A while back i posted this problem with my 4runner and since then it was doing ok and now its acting up again. A few months back i lost almost all power in DRIVE, pedal on the floor and it would on go about 30mph. I had my buddy bring his computer home from work and it said the Throttle Position Sensor was bad. I replaced the TPS over this weekend, and it ran fine when i test drove it and the check engine light shut off. Then my wife drove it to work that night and it acted up again, sputtering, almost no power and check engine light came on again. Im thinking maybe a tune needs to be done or maybe the throttle body is bad. Has anyone had this problem with thier runner before?