69 blazer runs rough when engine gets up to running temp.

i dont know what the deal is. it seems like it only acts up when the engine warms up. ill be driving or just at idle, it starts to run rough, like it it loading up on me. i have scanned the comp and it came back as the egr. so i changed it but it still does it, any help would be greatly app. thanks, anthony

69 blazer with an egr valve and a cpu? Check your vacume hose that feed the egr valve.

it is the linear type, i dont think it has a vacume hose on it.