starts hard when cold, stumbles sometimes when hot.

[iangoround]

Still working out bugs in my t2 conversion.

I just replaced the fuel rail as the old one sprung a leak. Now the car doesn't like to start when it has sat overnight or for more than a few hours. It fires right up on a hot restart though. Also, it starts to stumble a little at cruise or throttle changes once it has been driving for a while.

I don't have any meaningful codes and I'm stumped. HELP!

[Turbodave]

Try cycling the key to the on position 3 times before cranking the engine over when it's cold. This will prime the fuel pump 3 times and if it solves the problem then it's very likely related to pressure bleeding off while it sits due to a leaky injector, external leak, bad check valve in the fuel pump, or leaky regulator.

[iangoround]

Replaced the regulator with the one off the old fuel rail. starts right up now. Keeping it running when it is cold is another issue though.