The truck runs good until the outside tempture is over 100f, than it starts sputtering backfiring dying missing and just running like shit. The other day my brother come over to my house as he was driving up I could hear it sputtering and missing. When he got to my place I asked him what was going on? He told me that when it was hot outside (and it was about 104f) the truck just didn’t want to run. We had to do some work on my house and by the time we were done the sun had set and it was about 90f outside. He got into the truck and it started right up and purred like a kitten and he drove off, it ran perfectly. He has had this problem for over a year and it only does it when it is over 100f outside. Last week he drove it to Los Lunas (about 60 miles) and it ran fine but it was only about 95 outside. I haven’t had a chance to look at the truck, any ran into this before?