Hi gbob37, Welcome to 2carpros and TY for the donation
Check the fuel pressure to rule out the fuel pressure regulator and fuel pump. The pressure should be 55-62psi
Misfiring 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.
Saturday, January 30th, 2010 AT 6:42 AM