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First, what have you done maintenance wise? Replaced the Air filter lately? Replaced your PCV breather or PCV valve? Tune up done? Evap system in order? etc..... If you have maintained these things great !!! Then;

Most likely, your carburetor is running too rich.... So when starting cold, your enging is running too rich which will cause the sputtering until it warms up.... The 2.8 carburetor has no external adustments to correct this problem so a replacement carburetor or overhaul may be in order to correct this.

But if you have not changed your air filter in awhile, you could be starving your Jeep of the air it needs to run properly which could also cause the sputtering....

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Q: Why does a 1986 Jeep Comanche 2.8 liter start to sputter when it warms up and givenm a little gas?
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