Engine Performance problem
1994 Buick Century V6 Front Wheel Drive Automatic 138000 miles
Changed the plugs, and fairly sure all wires are where the should be. Feels like its not firing on all cylinders (kind of like me) Ran much smoother before new plugs installed. Rear wires are very difficult to get to and make good there is proper connection. Need to know what to check.
Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.