I have a 2001 Jeep Grand Cherokee Laredo, straight 6, 4.0L. It's running hard with jerking when pressing the gas, seems okay in neutral. I had it scanned for a code and it came back Cylinder 1 was misfiring. Hubby changed the plugs, then replaced the coil, then the fuel injector to Cylinder 1. The fuel filter is fine. (Thank you for that answer but we already checked that too.) Still no change in how its operating. The 'malfunction indicator light' is still on and blinking and it's running like ****. We are all stupified. Any other suggestions?? I miss my baby and with this NE Ohio weather, I need her!!!!!
Check the injector for proper voltage. Check the cam sensor,,,,,DO NOT remove it unless you index it to the block. generally, a malfunction of the sensor will affect all cylinders, PS: you did check to make sure there is adequate spark at #1 plug, right?
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