Hey guys i have a 97 4.6 it was starting fine but wasnt furing on b cylinders 1 and 6 .i changed coils plugs and wires and same problem I changed wires again and now I'm backfiring from exuast when I try to crank it and won't stay running,.Any help would be greatly appreciated. Thanks
Then by using a "noid" style tester, confirm there is a firing pulse from the PCM on the primary side of the coil pack.
Then use the "noid" tester to confirm that the injectors are receiving a firing pulse. Not a bad idea to also use a mechanic's stethoscope to "listen" to each injector.