aaronbond

I have an 85 gsl-se, 105,000. At and above 5500 rpms engine performance becomes sluggish, in gear and while in nuetral. Under 5500 driving appears unaffected. At the same time the idle has become erratic, sometimes revving between 300-1000 rpms, when the clutch is pushed in the idling steadies at 900, depressing the break has a similar effect. Do I have a vacuum hose leak, any ideas would be great.