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Bunker Hill, WV
2 or 4 wheel drive? Auto or manual trans?
Did you check ALL fuses and any ground wires to engine , before replacing alternator? Battery FULLY charged , before starting up with new alternator?
Has the dealership been able to duplicate the symptom?
Have you had your tires inspected recently?
Is the 'SRS' light also on?
Accessory power outlet? 'ACC PWR'?....BEST bet - test ALL fuses , but I do agree with M.A.E. ,
Where was the last oil change done? Maybe try doing an oil change with a 'NAPA GOLD' or 'WIX' filter and premium grade (NOT synthetic) motor oil , and see if it makes a difference.
auto or manual trans?
Unplug the very expensive device and determine the CAUSE of the multiple misfire....vacuum leak , wiring damage , sensor problem...IF this' very expensive device' is truly a scanner , than that should be giving some basic info as to where to start , in the diagnostic process. Did this problem happen suddenly , or has it been getting worse over time?.......?
No owners manual? --On level ground , only put enough in to bring it to the 'full' mark on the dipstick.