1987.5 CGT: Loss of power

[David]

Yesterday, I heard a belt screach and ever sicne, I've had major power problems. She won't rev out past 4,500 RPM. She seems to have great low end power (possibly more than before), but SUCKS above 3,800 and won't rev past 4,500. But here's the interesting part...it doesn't act like this all the time. Some times it's fine and revs nicely all the way to the redline. It's almost like if you rev her out all the way onece, something happens and it won't rev out until you turn it off and restart (I have not 100% confirmed this theory). No ECL, but when I am experienceing the problem she sounds funny. The engine gets MUCH louder and has a much deeper tone and you can hear the intake much more (or at least that's what I think I'm hearing). Any thoughts? Was the belt screech a conincidence? Could that belt screach have been the timing belt? Like now the timing is FAR too retarded? Any easy things to check before taking her to the shop? I did notice that the hall sensor feet are broken and it had pulled out a little, I slipped it it back in and will use a zip tie to hold it in place. Could a loose hall sensor cause this? Up until this, she has been very reliable.

TIA,

Dave
1987.5 CGT SE Virginia