I started my car up but it keeps cutting off, is it time for a tune-up? on 1991 Mitsubishi 3000GT

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The problems for both questions just started last week.
(1) Answer
Needing a tune up will not cause stalling in most cases. You could easily have ignition problems or fuel pressure problems causing the bad running. Get it to a Mitsu expert. The car was sold under the Dodge label so a Chrysler specialist may be able to help you too.
If you want to find a specialist, here's a directory link for you: