About a few months ago flashing cel. came on started misfiring, I replaced the coil pack, spark plugs, & wires used the right firing sequencing. As I pulled put of my driveway my car started idling low & vibrating I got down & around the corner put it in neutral to rev it & see of something needed to be cleared. Nothing. I drove it a short distance & every time I stopped my rpm dropped, & upon take off my acceleration was slowed. The light is flashing happens 76 times in a sequence turns solid several minutes blinls again. I know 1 reason the check engine light is on is.due to a failed egr sensor. What could be wrong now?