Why does my Daewoo Nubira shudder when I accelerate?

Short answer: A shudder when you accelerate in a Nubira is most often overdue maintenance: spark plugs, plug wires and the fuel filter, members said. On a manual, also check the clutch and engine and transmission mounts. A worn timing belt doesn't cause a shudder; it runs fine until it snaps, so replace it on schedule anyway. If you get a P0300 (random misfire) code with fuel trims far negative, something is making the engine run rich or making the computer think it is.

Symptom: The car shakes or shudders when you accelerate, getting worse over a week or so. Or the check engine light shows a misfire code even though it seems to run fine.

What to check first

1. Replace old plugs, wires and the fuel filter if you don't know when they were done.
2. Try a strong fuel system cleaner if you suspect bad gas, and fill up to dilute it.
3. Manual transmission? Have the clutch and the engine and transmission mounts checked.
4. Got P0300? Do a compression test and have the fuel pressure, oxygen sensor and MAP (manifold pressure) sensor checked.
5. Check when the timing belt was last replaced.

Likely causes

1. Worn plugs, wires or a clogged fuel filter. Members' leading suspects for shudder.
2. Slipping clutch or worn mounts. Both can feel like a shudder on acceleration.
3. Bad gas. The Egyptian owner's mechanic suspected it.
4. Rich-running fault: O2 sensor, MAP sensor or fuel pressure. Suggested for the P0300 with -40% fuel trims.

What it usually costs

No owner posted prices. Plugs, wires and a filter are a modest first step before clutch or sensor work.

Is it safe to keep driving?

Usually drivable gently while you sort out maintenance. If the check engine light flashes, stop driving. And an overdue timing belt can snap without warning. Verify with a mechanic.

DIY or shop?

DIY for plugs, wires, fuel filter and code reading. Clutch, mount and fuel-trim diagnosis are shop jobs for most owners.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists these recalls touching this area of the Daewoo Nubira: 04V357000 (1999-2002 model years, engine and engine cooling); 04V394000 (1999-2002 model years, engine and engine cooling). Check your VIN at nhtsa.gov/recalls. If your car is part of this recall, the dealer fixes it for free.
• NHTSA complaints: 44 keyword-matched complaints for Daewoo Nubira 1999–2002 (of 492 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-25; keywords: shudder, misfire, hesitation, stall, rough, jerk, clutch, timing belt, acceleration). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2000 Daewoo Nubira (manual trans) Shudders during acceleration on Car Talk, a 2000 Nubira manual increasingly shuddered on acceleration; the mechanic blamed bad gas, and the owner feared the timing belt. Members said a timing belt doesn't affect running until it snaps, pointed to plugs, wires, the fuel filter and fuel system cleaner, and also to the clutch and the engine and transmission mounts.
• In P0300 Fault and Freeze Frame on Car Talk, the owner of a 2005 Holden Viva, which they described as a rebadged Daewoo Lacetti/Nubira (the later Nubira design, not the 1999–2002 car), had a P0300 code with fuel trims around -40%. Compression was 175 psi in every cylinder. Members said something was making it run rich or fooling the computer, suspecting the O2 sensor, MAP sensor or fuel pressure, and one raised the crank sensor.

Quick tip

A shudder that builds over a week is usually wear, not a disaster. Do the cheap maintenance first and see if it goes away.

Vehicle focus: 1999–2002 Daewoo Nubira (2.0L four). The second thread is from the later Lacetti-based Nubira sold as the Holden Viva.

Safety / mechanic note

A flashing check engine light can damage the catalytic converter; stop driving. Verify with a mechanic.