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.
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.