p0303, p0306 have two cylinders misfiring, what next inline 6

Question

jeep grand cherokee 2002. P0303 & P0306. doesnt run well on four cylinders, what next?

Comments

I changed the coil pack and plugs.  Now I get random multiple cyl misfire #s 2, 3, 6.  Its worse now.  Now what?

Answer 1

You could start by checking the spark plugs. When was the last time you change the spark plugs? if the plugs are OK you may have to replace the ignition coils or injectors.