Post specifics for your car when asking for help with problems: Year (done), engine (even if it's an '86.5 if could still have a swapped in 7M-GTE or other engine), and any engine related mods (fuel controller, turbo upgrades, afpr, BOV and how it's plumbed...
GE fuel pumps are just as reliable as the GTE fuel pumps... except for when they're being forced to work overtime from a N/A-T or similar upgrade.
What's the ignition timing set at and is it set right? Disconnect the O2 sensor next time it occurs and see if that changes anything. Test the ECU temp sensor in the kitchen with a pot of water on the stove and check at several temps.
Good luck with it! ciao
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