1996 S 10 Blazer starts and stalls immediately

1996 S 10 Blazer. 4.3 liter engine. Just finished replacing the original engine with one from a bone yard. The engine runs for about 3 seconds, but
then stalls immediately. engine runs fine when it is running. Any ideas as to what i should look for? any help appreciated.
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Dardamar wrote:

Well, always two places to start. Spark and gas. Put a fuel pressure gauge on it and see if the fuel pressure is holding when it quits.
CHeck to see if it has spark when it quits too. A timing light can be useful for that.
If the oil pressure is low (or if the sender is bad), it could cut off the engine.
Bob
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k, got it running now, but now it dont shift into first gear and seems too lack power. anyone have ideas.

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