535 starts but runs short time before quit.

[Gene in NC]

535 starts but won't run. Needs a touch of either to start but will then run at high idle for up to half a minute. Reported one minute run on last attempt. Correct initial fuel pressure. Fuel and main relay replaced with known good swap.

[632 Regal]

what is the FP when it is running/as it dies...sounds just like a fuel issue to me.

[Gene in NC]

Will check the running FP at time of failure when moved to my garage. Good suggestion. Really seems more like ignition. Just cuts off cleanly.