I have a 1995 Ford Mustang V6 3.8L that shakes at idle, the whole car shakes pretty bad. The car doesn't really pick up speed, you can pick your foot to the floor and it will take like literally a minute to hit 60mph. The check engine was off for a little bit, but when i went halfway down the street the check engine light went on, then it started blinking about 2 miles later. Ive replaced the head gasket set, spark plugs, and radiator. Ive heard some people say it may be the mass air flow, and some say it may be the harmonic balancer, but they were only for similar symptoms and cars, so now I'm to the point where I need to know exactly so I posted my own thread. Let me know what you guys think is wrong.