After running fine in city stop-and-go traffic for 15 minutes, the engine rumbles roughly then stalls dead. After sitting 5 minutes, it starts and runs again for a while, then stalls again.

Within the last 5,000 miles, we’ve replaced the water pump, thermostat, timing chain, chain guides, tensioner rail, cleaned idle valve, replaced O2 sensor, replaced thermo time switch, replaced fuel pump control unit relay, cleaned idle control valve, checked fuel lines and fittings, and replaced idle control unit.

It still stalls. If you’ve got any thoughts on solutions to this problem, please help. Thank you!