Plugs on 3.5 Chevy Colorado

need to get a repair manual most auto stores carry them or online

plugs are always the last to suspect when there are misfires
It is most likely injector problem from
low fuel pressure ,
dirty injector tips , injector wiring and harness or
ECM problems

Are you sure you replaced the plug wires correctly? As for the engine noise, is it overdue for an oil change?

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.

The plugs are under the coils.You have to remove the coils to get to the plugs.Hope this helps.Good luck.

A tune up would usually include replacing the plugs and fuel filter.The plugs are under the ignition coils which are located on top of the motor.just remove 1 coil at a time and replace the plug for that coil.You will need an extension to reach the plugs.Make sure and gap the plugs.The gap specs is 0.042 in.You can also use a piece of vacuum line to install the new plugs back into the hole.I believe a 7/32 hose will work.If you are having certain problems let me know and I can help you further.Hope this helps.Good luck.

If your truck has the intak filter box on fire wall and air box over the valve cover remove it. remove the flex tube for the fire wall to the box ontop of the valve cover screw driver. Do the same to the throuttle bodody flex tub remove it as well Then there are two screws I think 12mm on the passangers side of the box. Pull away from t-body and up the coil packs are under the box. Simple remove one bolt from each coill and pull it up and out "do Not **** on the wires". Then pull the plug out and replace.there is a 3/4" blow back tube you will need to remove and put it back on after the pluges have been changed.

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