So my 85 GSL-SE has started having issues with stalling out if I run it for more than 15-20min. If I try to restart it immediatly, it won't start, but it will if i leave it for 10-15min and try again it starts. If I have the radio on, the speakers sound like they're losing power just before it stalls. This makes me think that the issue is electrical and not fuel line related. It seems to run better if I turn off the radio, lights, ect, but still stalls out after a while. Any ideas what may be causing this and how to fix it?

 

Check your BAC valve, as well as the ECT sensor.

Have the alternator and battery tested.