I noticed my truck sputtering the other day. It died when I stopped. I got it home barely and let it cool. I cranked it back up and put it in gear and it was fine. After the temp comes up to normal it dies when I put it in drive. I changed the fuel filter and still doing this. I put a new fuel pump on a couple of months ago and it is working fine. Could this be the Mass Air flow sensor? It idles fine and revs great ...It just dies when I put it in gear after warming up.

 

what are your rpms when u go to put it in gear and have u checked for any vacuum leaks?

 

I don't think there are any vacum leaks. Under 1000 rpm by far. Idles fine just like always. Will take gear when cold after cranking. When it get up to regular temp it will die when put in drive. auto tranny