Q: P0300

asked by on

Rough idle when given gas it gose slow then picks up if started for more then 30 min it shakes
I changed all spark plugs and wires and coil packs My car has 180000 miles.
My car has an automatic transmission.

You will need to have the engine fuel pressure and injectors checked to see if the pressure is low and if okay then the fuel injectors may need cleaned. This can cause the problem you are having.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: What would cause the MPG gauge to fluctuate on a 1999 BMW 323i?

Hello, thank you for writing in. There are several different systems that interact with the fuel system which effect fuel economy. The first that you will want to check is the ignition system. Make sure your spark plugs are new...

Q: Q: Windshield wipers wont turn on

Hi there. There are many reasons why windshield wipers may not work, ranging from a fuse or electrical relay being blown that powers the wiper module - which relays power from the switch to the motor. You might want to...

Q: Q: Leaking coolant

If you have a coolant leak on your car it can normally be found by observing where it is leaking from to determine what the cause of the leak is. If it is leak from the front of the engine,...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.