Thanks deermagnet for this valuable information. I don't remember who told to use break cleaner, but did the same. Tried on the EGR valve and did the same as a throttle cleaner, but thank for telling me that I'll be careful. I forgot to say that all this problem begins right after rebuilding the transmission. First the light for Check trans turns on. My mechanic used his computer and erased the code but then the code for the EGR comes up, the same you mention. Got fixed the coolant sensor cable (accelerates way up above 1500rpm's)and the trans begins to work properly(it did not use the overdrive on highway above 55mph). I'm going to follow your tip and buy a code reader, and maybe learn to live with this light on if I can't fix it.
Thanks a lot for your interest and help