I have a 90 cougar s.c. which has developed a hole in the EGR pipe coming from the exhaust manifold and am thinking about removing the EGR valve completely (corking the exhaust manifold and vacuum lines and blocking the back of the intake tube with a plate of some sort). Q: how will this affect my performance, I was told because of the altitude here (3500 ft above…) that it might not idle properly. Has anybody done this and how did it affect your performance?