Pulling engine out and replacing it

Question edited for clarity.
Question moved to category.

5. One for each spark plug.

https://www.google.com/search?q=05+chevy+colorado+3.5+coil+packs

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Videos and text based articles

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remove the bolts that hold the fuel rail. Lift the fuel rail, pulling the injectors out carefully. Make sure the rubber seal comes out with the injector. Remove the electrical clip for the injectors you want to change. Clip in the new injector, and replace the fuel rail and the injectors.

Wheel Nut Torque..........103 ft. lb. (140 Nm)

You should see a spark plug wire for each spark plug. The spark plugs are in the cylinder head. You have to unplug the plug wire first before you replace the plugs. Be careful as to not damage the plug wires when removing them. Be carefull not to get dirt into the cylinder when replacing the plug. Do not overtighten the new plugs. I can't remember which side of the engine the plugs are on, on your truck. You truck has the inline 5 cylinder I think.

You would need to find something that is the same as sychromesh fluid that GM uses.

well thanks.

blown head gasket or a crack in the engine block... what colour is your exhaust ?

Sounds like it needs spark plugs and wires, and a fuel system treatment.