[DML] Hard start problem
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[DML] Hard start problem

I'm having a bit of a problem starting my car. When the engine is warm, it 
has the typical hot start problem. After about 20-30 seconds of cranking, 
it finally turns over. It may stumble for another few seconds before it 
gets up to idle speed. But afterwards, the engine runs perfectly. As for 
the fuel system, the accumulator was replaced about 3 years ago. The fuel 
pump/check valve, fuel filter, and O rings in the primary pressure 
regulator were replaced within the last year.

Now here is where it really gets interesting. If the car has been sitting 
for more then a day or two, it has problems cold starting. It will usually 
fire right up for a second then die. This tells me the ignition system is 
working and so is the cold start valve (directly tested as well). Once the 
engine starts, it's just like the hot start were it stumbles for a few 
seconds before reaching idle.

I'm not too sure what the problem is here. The technical manual says for 
hot/cold start problems only, it's the air sensor rest position. However it 
sits flush with the funnel, so I don't think that's the issue. Is it 
possible to have a bad warm up regulator and dirty injectors without 
causing problems once the engine is running? Or do I need to just cave in 
and get a fuel pressure gauge to test the different pressures?

Any suggestions would be greatly appreciated. Thanks,
VIN 4099

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