My question may be related to this other one, but its answer is inadequate for me to be able to diagnose my problem and know what to do to fix it.

When I start my car in the morning (or sometimes after work if I work late), the car starts fine and idles normally. However, once I press the accelerator and pull out of my parking spot, the engine begins to run rough for 3-4 seconds. During this time, I have very little power/acceleration. Then, the engine smooths out, my power is restored, and all is fine until the next morning.

This problem has only recently started; there hasn't been any obvious trigger event, to the best of my knowledge.

What’s going on, and how can I fix it?

2003 Hyundai Elantra

  • 1
    Do you see different behavior in different weather?
    – Bob Cross
    Commented Jun 30, 2014 at 13:29
  • Also, does it make any difference if you let the car sit and idle for a while (let the car warm-up)? Commented Jun 30, 2014 at 14:25
  • Scott, check the connection at the PCV valve/boot. I've had two oil changes where the boot was either left disconnected, or damaged and shoddily repaired (like with electrical tape O.o). In both cases, I didn't notice until the next day--something about a warm engine must soften the symptoms--and the first time I didn't consider it might have been something related to the oil change for a couple days. It's easy check, I hope it solves your problem.
    – elrobis
    Commented Jul 22, 2014 at 18:06
  • and what's the odometer reading?? Commented Sep 26, 2014 at 5:15
  • About 145k miles Commented Sep 26, 2014 at 17:16

1 Answer 1


Injectors or spark plug leads (if not using coil packs). When was the last time u changed your plugs? Also check for tears in vacuum hoses. Though usually vacuum leaks symptoms wouldn't disappear.

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