So I put new head gaskets in my car. Seems like it's not pulling like it should. Changed the fuel filter. Idles a little rough. Runs fine expect when I goto stomp on it, any ideas on what to do? Spark plugs have been changed. Some no name brand. It's a 95 5 speed. Also it seems the harmonic balancer seems to be wiggling a lot at idle but once you get on the gas a little bit it doesn't do it as much. Would you think it's shot? I just fired up my 90 sc and it doesn't wiggle nearly as much.