Skip the auto shop - Our mechanics make house calls

Q: I have a random misfire

asked by on

I have a random misfire code p0300 on my 98 chevy truck. I have replaced plugs, wires, cap, and rotor. Also replaced the MAF, i have troubleshot it down to the possible spider injection system failing. I removed the throttle body assembly and saw there is excessive sludge and what looks like fuel on the intake manifold. Im really running out of ideas and dont want to throw parts at it constantly til it runs right.

Hi there. Typically the P-0300 error code indicates an electrical issue somewhere in the ignition system that causes a random misfire.. In most cases, it’s caused by damage to the distributor, coil or a camshaft sensor. Before you spend more time and money chasing the problems, you might want to contact one of our mechanics complete an engine is misfiring inspection to pinpoint the precise source of your issues.

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: My truck shakes when i go 60 mph

Generally, if you feel a shake in the steering wheel, the problem is up front. If the shake is felt more in your seat, it's coming from the rear. Front possible causes: Out of balance or out of round tires....

Q: What transmission will work. Chevrolet Truck

Hello. It is possible to use the manual transmission out of a 2 wheel driver Chevrolet truck in a four wheel drive model. You need to make sure that it is made for that engine size and then you will...

Q: Hard starting in morning.

The hard start may be from the fuel injectors sticking and combustion chambers carbon build up is causing hard starting. Have the fuel pressure first checked to make sure it is high enough. Then have combustion chambers cleaned and injectors...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.