Whenever my mothers 1998 4 cylinder camry hits 70 or 80 on highway travel, the car stalls out and dies, from the sounds of it it starts up again fine and runs fine until that 70 or 80 MPH mark. She has had it to two mechanics who have no idea what is going on. Even hear of anything like this? Let me know if you need any more info. Thanks.

sounds like either the maf or map sensors,have you had it scanned for codes?

Honestly, I'm not sure. I'll pass that info along, thanks.

[QUOTE=x047x]Whenever my mothers 1998 4 cylinder camry hits 70 or 80 on highway travel, the car stalls out and dies

Try checking for excessive exhaust back pressure (from a partially blocked catalytic converter)
Connect a vacuum gauge to the intake manifold, run the RPMs up to around 3k and watch to see if vacuum falls at steady RPM.
Falling vacuum at the intake manifold would indicate increasing back pressure that could cause the engine to stall out and die, where at lower speeds, under light acceleration, could be OK
Just a guess, but that's the first place I'd look.