2007 Hyundai Accent 5 speed manual - tachometer jumps up and down upon start up, and the engine misses. This eventually smooths out after a mile or two. What causes it?

Asked by Jan 22, 2016 at 10:37 AM about the 2007 Hyundai Accent GS Hatchback

Question type: Maintenance & Repair

When I start my car, the tachometer will jump up and down and the car
misses. It continues doing this at stops for a mile or two.  Then the car seems
to run smoothly.  What is causing this?

5 Answers

46,075

When was the last time you did a tuneup?

What is involved in a tune-up? I have had both oxygen sensors changed and new spark plugs

46,075

Spark plugs are the main thing these days. An air filter and fuel filter are also a good idea. Is the check engine light on?

46,075

I would also use a good fuel system cleaner in your next tank of gas.

The check engine light is not on. I used a fuel system cleaner in the last tank of gas. The air filter was changed about 2 months ago. I guess I will try a fuel filter next. Thanks for your help!

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