I'm having two problems with my SC1:

1. The engine sputters while accelerating when I first start it. The problem disappears after driving for 15 sec or so.. Possibly I need to change the plugs??

2. Theres a squealing noise when the RPMs go above 3500 or so. Not sure if this is a belt..

Thanks
Mike

The squealing noise is most likely the belt pulley bearings. The misfiring could be plugs, egr, ects and or the throttle body and intake manifold need to be cleaned out. All of the above mentioned are common problems which if serviced should take care of your problem.