Code help
 

Got a code as I was on way home from work and all of a sudden no pedal response for a quarter mile then came back to me. This happened along time ago once as well. Code was p0121 or something like that which said it was failure to start due to mechanical, fuel or ignition condition. Checked it with my smarty then started truck back and check engine light was off. What is that all about anyone else ever experience this?

Happened again to me tonight. Is this a pretty good indication of a bad tps?