Problem with misfire on acceleration 98 4.0
I have a 98 cherokee 4.0 that misfires on acceleration. Now it does it only after I have run
the Jeep (warmed it up) then after it sets for about 2 hours or so usually after I take off
from the first stop sign, it lasts for about 10 seconds. After that it runs perfect. The Jeep dealership has, done the following: changed TP sensor, MAP sensor, oxygen sensor, coil, distributer cap, plugs, wires, air cleaner, they have done an engine combustion cleaning and it still does it. They have done a computer recording of it when it acts up and have told me that the map sensor reading shows a drop in vaccuum. They are now scratching their heads wondering what to do next. The Jeep runs perfectly otherwise. Any help would be greatly appreciated.