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I have come up with a 2002 4.3L complete (minus ECM and Accessories). I currently have a 97 sonoma. What problems might I encouter when installing this engine. Please give details. BTW I have a 2wd and this engine came out of a 2wd.
 

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Most of this thread applies to what you are doing, if you have questions beyond this ask: http://www.s10forum.com/forum/showthread.php?t=237758

It should be fairly streight forward.
You have an extra coolant temp sensor under the thermostat in your '97 that the new motor doesn't. I would just swap manifolds. Swap the new injectors into the old manifold if you want.

Also, knock sensors are a little different.

And whatever else was in that thread.
 
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