check spark plug gap and firing order-also check to make sure plugs are tight and wires connected
not necessarily unless after replacing plugs your engine misfires.
Valve cover gasket needs replacing
the spark plugs are located on the front of the engine under the hood
On sides of engine block.
its at the bac of the engine under the cooler cables
Three on the front of the engine and three at the rear.
first you need to state what liter the engine is.
check spark plugs and wires
Not running on all cylindersBad plugs?Bad wires?Bad valve?Bad piston? Service engine light on?Have vehicle scanned to determine problem
P301 is cylinder 1 misfire. The easiest fix is replacing the spark plugs, but the problem could also be cause by a burned valve or a malfunctioning injector.
On older cars it would be replacing, PCV valve, spark plugs, plug wires, rotor, condenser, and possibly distributor cap. On newer cars it usually means replacing plugs & plug wires.
There's a different question here with a good answer. (Search for spark plugs on a 93 Buick Century.) Briefly, there are three on the front of the engine (near the cylinders themselves), and three more in back.