Skip the auto shop - Our mechanics make house calls

Q: P0300 code random misfire code

asked by on

My 1999 GMC Yukon slt has been having this P0300 random misfire code come on but it come on and go off every week and when it does its hard to start my truck I have to hit the gas to get it started

A: Hi. Several components could cause this pro...

Hi. Several components could cause this problem - old, failing plug wires, old plugs with wide gaps, worn or corroded distributor cap or rotor contacts, failing distributor pickup coil issues, or failing ignition coil packs. Diagnosis with proper electrical testing gear is the only way to isolate random misfire issues. For further help, a certified professional from YourMechanic, can come to your car’s location to inspect the misfiring issue and move forward with repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gear selector stuck in park

Hello. This is a common problem in both Chevrolet and GMC trucks and SUVs of that year. The safety system requires pushing on the brake to start the vehicle, so the problem is likely that the brake switch on the...

Q: I was told I needed a tune up got the spark plugs and the coil pack but it still misfire.

Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft...

Q: My Durango has been running great one morning went out to start it it won't start but cranks there is No fuel getting to my motor

If the fuel pump is running but no fuel is getting to the motor then you will need to have the fuel filter checked for blockage. If filter is blocked then replace it and take a fuel sample to see...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.