Earlier today on this site I saw an article about a book that is helpful if you own a 73-87 Chevy truck.I firmly believe that books are a great way to learn,I have three that I depend on.Yet experience can not be measured by what you learn in a book,learning by doing just can not be beat.For this reason alone I have to say thanks to each person who has given me advice on the problem I had with my truck.I just tested the EGR vale and found it not to hold pressure,replaced it and can now drive and enjoy the truck I just love to drive,wash,polish and wax.Thanks again.you all are the best.