all of the sudden I started my 82 gl yesterday and the tac was viciously jumping up and down but it wasn't revving the motor all the way. I could kind of hear something under the hood making kind of a slipping/skipping noise. I thought it could have been frozen coolant because its mostly straight water and it was freezing outside. so I let it warm up while doing this then went on my way. it would stop for a little bit but even once warmed up and driving it was still fluttering even in 4th gear going 55. its really not wanting to stay idling now either. when I put the clutch in to come to a stop it idles down and dies if I don't rev it in time. Anybody ever experienced this? Please help! THANKYOU!