95 Jimmy 4.3 stalling off and on

[newman12fan]

Hey guys, it's been awhile!!!
Anyway the jimmy's acting a little strange. I can drive it about 3-4 miles and it will act like it is going to die, but if I powerbrake until I get it off the road, then I put it in park and keep accelerating for a moment and it will clear out, and won't do it again for a few days, sometimes a week or so. I do add techron religously. Do you think it could be the egr screen clogging up again??