It's a EB431 (I think) that I've had for 5 years with no trouble until last week. I had to have the source coil replaced. So I get it back a couple of days ago and it doesn't seem right. It doesn't feel like it is hitting max rpms and there is a vibration that was not there before. I called the repair shop today and asked if it these 2 symptoms could be related to the coil. They said no. Why would it run fine before the coil went and run like **** after a new one was installed Any suggestions?