2002 Jeep Grand Cherokee i need help

2002 JEEP GRAND CHEROKEE
4.0L • 6 CYL • 4WD • AUTOMATIC
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FREDTWUMYEBOAH
  • MEMBER
  • 1 POST
i have grand cherokee 4.0L 2002 model. about a month ago my car started misfiring from some of the plugs. so my mechanic detected that the A,B and D coils are not working. so we bought new one to replaced it. but still the problem came back.
what can be the problem
Jun 17, 2014 at 10:02 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check compression and fuel pressure with a gauge. then rescan an d have the mechanic freeze frame it to see if it's another sensor screwing up
Jun 18, 2014 at 6:29 AM
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