Car stalled a few times while my mom was driving (it had just reached operating temp a few miles from home). She got it home and parked it. After sitting a few days, it started right up today but after ~5-10 mins, after it was warmed up it slowly died and I couldn't restart it. Checked fuel pressure by cracking line at fuel distrib and also at injector, good pressure. Next checked spark at plug, strong. Sprayed starting fluid into throttle body, nothing, not even a pop. Fuel pump is coming on, checked relay and OVP. Let it sit/recharged battery for 1 hr. Got it to light with throttle fully open, felt like it was flooded but plugs were dry when I earlier checked for spark. Revved it up to redline a few times, settled into nice idle. I checked for air leaks all around the CIS-E rubber with propane. Nothing. Let it idle for an hour and it restarted just fine.

Any ideas what I should be looking into? Don't want to break down during a test drive.

Thanks.

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1988 300E