Q: Q: My engine is misfiring.

asked by on

replaced, plugs acdelco regular copper oem gapped at 45, wires acdelo, cap and rotor accel brand, coil duralast, fuel pump sprecter premium with sending unit. misfire under acceleration and really noticeable when in gear low rpm. was doing this before I changed anything.

My car has 65000 or 165000 according to odo miles. engine is 305 My car has a manual transmission.

Hi there. Check the injectors on the throttle body and see if they have a metered spray. If the injectors are spraying correctly, then there is a vacuum leak on the engine and is only effective when under a load and at low rpm’s. Check all vacuum lines and the brake booster. Replace any cracked, broken, or missing vacuum lines. If all of the vacuum lines are good, then there could be an internal issue with the engine, possible burned valve or rings. If you need further assistance with your engine having a misfire, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Q: My engine is misfiring.

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: Stabilitrakservice light is in with traction control light

The stabilitrak and traction control systems may become inactive if the engine light is on. The code for a cylinder misfire on cylinder #7 may be due to the engine oil system containing sludge from improper oil change intervals. This...

Q: Car not starting after heavy rain.

I believe your vehicle has a bad distributor. Often times with some age on them moisture can get inside the distributor cap and cause the contacts to get corroded. When this happens your car will be hard to start or...

Q: Transmission fluid pouring through dipstick tube any ideas where to start

If you are adding transmission fluid and it is leaking out as you are adding it, the tube has a hole in it. You will have to replace it. If the transmission fluid is coming out of the top of...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.