Start with coil, plug wire or faulty spark plug, although if it was the coil you'd probably see two cylinders not firing. Bill in Yardley, PA wkdenton at verizon.net ----- Original Message ----- From: "Dave Daniels" <dwaynedaniels at sbcglobal.net> > > So, it seems no. 4 isn't firing. Any ideas? > > Thanks, > Dave D.