Hi, my '88 GSL-SE revs up and down from about 1,500rpm to about 2,800rpm and I can't seem to get rid of it. Any ideas? I'm new to this site, so I'm open to any suggestions anytime! Thanks

 

Can you be more specific? A GSL-SE would be a 1st gen model, which ended in '85. An '88 would be a second gen car. But I can say that a bouncing idle can be TPS related if we're talking about fuel injected 1st or 2nd gens.