umm yes they mean spark plugs pull them all. make sure you note where all the wires go so(spark plug wires)you can put them back in the same spot. one or two of the plugs should look different, they will be wet(this will indicate where the problem is). get a compression test guage from the auto parts store. what that does is essently leak test the head gasket,piston rings, valves,piston and head. the compression tester is a pressure guage with a hose attached to it, the end of the hose threads into the spark plug hole.(you do one at a time) after you install the tester in the #1 spark plug hole then you turm the the key (on the steering colum) like you are going to start the car. the engine starter will turn the engine and your compression tester will give you a reading. now you write the reading down. when they are all written down look at them if one is 20psi lower than the rest that will indicate a blown head gasket. If the compression test is good but you have a wet plug (only #1,#4,#5,and#8) the problem could be a blown intake manifold gasket. good luck