We have struggled to keep this car running.

The engine has been rebuilt, radiator replaced along with timing belt. Our current problem is the car will not go over 30 miles an hour. When car, which is an automatic shifts when increasing or decreasing speed the hole car jumps and shakes. We replaced the ecu with a rebuilt one and the car ran great for about 10 miles and then started to fail again.

We are one repair from junking the car. Any input would be very helpful.