HI. I'm new to this forum. My sister has an '89 Toyota Supra hand-me-down from my mom that is having problems with shaking at idle. It is an intermittent problem that comes and goes. The car runs fine except when at a stop it will shake. Car also is running sluggish even with 10 degree timing. It seems like it has always been sluggish even when my mom bought it brand new. Not sure of that has any relation to the shaking. The cylinders pressure check is fine. Changed out the idle sensor. Any ideas what it may be? Maybe some common problem?
Thanks