100 Series Land Cruiser / Lexus LX 470: Rough idle, stumbling or a misfire code (P0300 to P0308)

Checks, in order

1. Read the codes
   A code for one cylinder means a coil, plug or injector on that cylinder. P0300 alone is random and often a lean or vacuum problem.
   easy $ · under about $50
2. Plugs and coils
   Pull the coil from the misfiring cylinder and inspect the plug. Swap that coil with another cylinder and see if the misfire follows it.
   medium $$ · about $50 to $500
3. Intake leaks and air filter
   Inspect the intake boot, PCV hoses and brake booster hose for cracks and make sure the air filter is seated. Listen for a hiss at idle.
   easy $ · under about $50
4. Throttle body and MAF
   Clean the throttle body and the MAF sensor with the correct cleaners. Do not touch the MAF element.
   medium $ · under about $50
5. Injector and compression
   If swaps do not move the misfire, listen to the injector with a stethoscope and run a compression test on that cylinder.
   hard $$ · about $50 to $500

Applies to: US-market UZJ100 Land Cruiser and Lexus LX 470, 1998 to 2007, with the 2UZ-FE 4.7L V8 (timing belt). AHC items apply to the LX 470 only; most US Land Cruisers have conventional shocks. Transmission is the A343F or A750F depending on year, so check the fluid spec for your truck.

Tools and parts for these checks

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Go deeper

• Toyota 2UZ-FE 4.7 V8: Specs, Reliability & High Mileage Guide

The same problem on other Toyotas

• 4th Gen Tacoma (2024–present): Rough idle, misfire or shaking at a stop
• 3rd Gen Tacoma (2016–2023): Rough idle, shaking at a stop or misfire (P0300 to P0306)
• 1st Gen Tacoma (1995.5–2004): Rough idle, misfire or lean codes (P0171, P0174, P0300)
• 5th Gen 4Runner (2010–2024): Rough idle, shaking, or misfire with a flashing check engine light
• 4th Gen 4Runner (2003–2009): Rough idle, misfire or hesitation
• FJ Cruiser (2007–2014): Rough idle, stumbling or a misfire code (P0300 to P0306)

Other fuel & ignition problems on the 100 Series Land Cruiser / Lexus LX 470

• Engine cranks normally but won't start
• Check engine light with P0171, P0174 or air-fuel sensor codes (P2195, P2197)

More 100 Series Land Cruiser / Lexus LX 470 problems

• Timing belt due, squeal or rattle from the front of the engine, or coolant and oil weeping at the front (Engine)
• Engine temperature gauge climbing, overheating or losing coolant (Cooling)
• Turn the key: click or nothing, engine won't crank (Starting & Charging)
• Check engine light with secondary air injection codes (P2440, P2442, P2445, P0418), whirring at cold start (Emissions)
• LX 470: AHC lights flashing, truck sagging, uneven ride height or won't raise (Steering & Suspension)
• Clunk, rattle or wander in the front suspension (Steering & Suspension)

All 15 100 Series Land Cruiser / Lexus LX 470 symptoms in the interactive troubleshooter →

General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.