Ok all, Ive had a random problem of when I get on the interstate and cruise my check engine light comes on, and its the EGR system. Doesnt happen everytime I get on the interstate, but it never comes on in town, and only happens if I cruise at a constant speed for awhile (read: it doesnt come on during the morning rush hour). However after a few nights of driving on the interstate with this glowing orange light Ive had enough. I change the EGR with another I had, and changed the MAP sensor with another I had, and checked the vac lines. No problems. This is seriously pissing me off. Any ideas? BTW, this is on the truck below in my sig, its the stock 87 tbi computer running the edelbrock mpfi conversion setup.