1990 4.9l and its just missing and i dont know why.

 

You might have other vacuum lines missing also,there should be a sticker under the hood that is a vacuum diagram,the green line should be for the egr valve , you might be able to figure it out by looking at that.That might be the problem your having on accel.

 

I got the same code and another one "evps beyond lower limit" or something like that. I can disconnect the vaccum line or the evps plug and she doesn't miss a beat. Sometimes I just think she's possesed!