There is 1 screw on top of each spark plug cylinder. Just remove the screw (I hope you removed the resonator first). The 2 plugs back towards the firewall are a little tougher to reach, just ensure when you put the new plugs in, that you do not crossthread them!
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Underneath all the plastic on the top of the engine. Remove the plastic and remove each of the 6 coils, (2 bolts for each coil). Your plugs are under each coil. Use AC Delco 43-103's, TB's love these more than all others.
CHANGING SPARK PLUGS IN TRAIL BLAZER. YOU NEED TO REMOVE AIR INTAKE RESONATOR AND IGNITION COILS.YOU NEED LONG 3/8 EXTENSION - SPARK PLUG SOCKET - 3/8 RATCHET WRENCH. NEED SPARK PLUG GAUGE AND A TORQUE WRENCH.YOU CAN GET BY WITH OUT ONE LONG AS YOU DONT OVER TIGHTEN PLUGS AND STRIP OUT ALUMINUM THREADS.
Remove the air cleaner outlet resonator from the engine. (the plastic thing in the middle) the coils sit right on top of the plugs. Disconnect the ignition coil connectors, then remove the bolt and pull out the coil. the sparkplug is at the bottom of the hole :) remember to torque the bolt back down to 89 in-lb (10 Nm) and use alittle dielectric grease on the end of the boot. and finally dont forget the anti-sieze compound on the threads of the new sparkplugs before installing :)
look at the distributer and follow the spark plug wires from it out to each spark plug but each wire as u pull them. dont take all off at once . or u might not know how to hook them all back the right way.
you have to take off top of plentum (big plastic piece on top of motor) you will see a round plastic thingy with plugs on them ,they are the coils (six if six cylinder) them them off and the plugs are underneath