What I wrote in my other post about rest pressure held in the system. My response was generic to both mechanical and electronic as both use the same approach up to a point.

Mechanical will have fuel lines directly to the injectors and no wiring.
Electronic will have a pipe taking fuel to the injectors and there will be wiring and connectors there also!

Art asked the question earlier as this model year might have one or the other.
Answering this question will help in what things that needed to be checked and an order.

A fuel pressure regulator are two totally different components in these also.

Amarin in brought up the "next basic diagnostic step" and it is the ignitions health.

Phil