[stormcrow]

Matt,

Sounds like your pressure regulator could be the problem. As you describe, when you first start the car, it stumbles and if you keep it running for about five minutes and shut it off and let it set, it starts right up.

The fuel pressure regulator is bolted to the engine so that the heat from the engine helps warm it up. In addition, there is a bi-metal strip which controls the fuel pressure at the fuel distributor. It may be that it is out of adjustment.

When cold, the fuel pressure regulator keeps the pressure low on the fuel distrbutor so that more fuel can go through the fuel distributor and out to the injectors.

As the bi-metal strip warms up, the pressure is increased on the fuel distributor which allows less fuel through the fuel distributor and then out to the injectors.

Checking the fuel pressures is the best way to determine if this is the problem.

If it checks out ok, then I would look at the cold start valve which could also be the culprut.

Steve