Wasn\'t the egr valve... now what? About a week ago I asked why my Blazer was surging under light acceleration. Glenn pointed me towards the egr valve and all the symptoms coincided with what the Haynes manual said about a bad egr valve. I replaced it yesterday and it's still acting up. So, before I go on a wild goose chase and start replacing half of the stuff under the hood, anyone have any other ideas? <font color=blue>Rob 85 K5</font color=blue> 24 beers in a case, 24 hours in a day - Coincidence?