I have been having a bad shake with my 1998 CRV (162,000 miles) when I am maintaining a constant speed between 40 and 50 mph. Sometimes the car will shake bad, sometimes it will just make a noise like it is trying to shake. When I let off the gas it stops. I took it in and my tie rods were replaced. This did not solve the issue. I took it back and and they said it was a problem with my tires. I replaced my tires and it didn't fix the issue. I am missing a lug nut on my front driver's tire (it's stripped) but would this really cause the shaking? If this was the problem wouldn't it do it all the time?? HELP!!