My fiance has a 2000 jeep cherokee sport with 4.0 straight 6 with 120,000 miles on it. has a problem starting and when it does start it runs rough for 10 - 15 min. when you go to start it cold it takes 2 good cranking sessions tto get it to start. after warm up it will start right up as long as it sits for less than 1 hr or so. she took it to a mechanic and he gave it a tune up ,replaced spark plugs and flushed in tank fuel filter. nothing changed . It shows no codes on the scanner and im at a loss since the computer technologies came out. Im old school backyard tinkerer! any suggestions would be helpful
Did you try changing the air breather for the motor?You need three things inorder for the engine to run well. Air,fuel,and spark.since you had a tune up and fuel flushed.I can only think of two things.First I never heard of flushing a fuel filter,you change it ( not flush it ) change your fuel filter,eliminate the guess work.And change your breather.
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