Ok guys, girls, and confused induviduals, my g/f was in the process of taking a trip in MY blazer from Kentucky to Alabama and it shut down on her twice. Twice i say because she for some reason started it again right after it died the first time and then consequently died shortly thereafter at a truck stop on ramp. She called me and told me what was going on right after it happened while i was at work. I...as a Fed Ex delivery guy could not stop what i was doing to go down to Tennessee to rescue her so I asked about the temperature first since she said she had been stuck in traffic. She told me it was fine...like 180ish...(her term not mine) and I thought that was odd because that is a pretty low temp to be stuck in traffic on a 90 plus day but it shut down like it overheated...so what's goin on?

By the way...recently I but on a K&N cold air and a Flowmaster 3" cat-back to dual and that's pretty much the only things recently that have changed
2000 4dr 4x4

 

She got oil????

 

full of mobil 1 synthentic as of a few days ago...oil still looks good

 

Got fuel pressure?

 

good fuel pressure...good oil...good water temp...good spark...good airflow just dunno...quits after about an hour of driving...did it myself today on my way to go play golf

 

After an hour on 90 degree days is the puzzling part. I could see it dieing after it warmed up. but not after an hour of driving. Everything has been warm for at least 40 minutes.

Oh crap, brain fart. ICM. replace your ignition control module. There is a special grease between it and the bracket it mounts to. This grease is designed to disipate heat. If the ignition control mopdule gets too hot, it fails. Cools off and it works fine again. ICM controls the spark timing. Take it in and have yours tested. I think they run less then $30 or so. Been a while so I am not positive on cost. Not 100% sure that is your problem, however it is a common way for them to fail.