Q: Misfire that got worse after coil pack and spark plugs were changed

asked by on February 11, 2018

Car was studdering took to autozone gave me a code for ignition coil so I went to a used auto parts and bout a ignition coil and took it to a shop where they put in new plugs and then changed the ignition coil only to have the issue be 10x worse now it studders on idle and I just don’t know what more I can do

My car has 198000 miles.

The engine can be diagnosed, and the fault pinpointed, if you request a Check Engine Light diagnostic. Trouble codes that refer to parts, in this instance a coil, do not necessarily mean that the part has failed. For example, if I were to merely create a bad connection to a brand new coil, I could generate a trouble code identical to that which you would get if there were a perfectly good connection to a bad coil. The point is you can’t buy parts on the basis of codes; any suspect part has to be tested directly. Autozone does not diagnose motor vehicles or test parts; they only sell parts. What you need is a pinpoint diagnostic identifying EXACTLY what is wrong with the vehicle and then you need to replace only the parts, if any, that are actually faulty. If you request the diagnostic, the responding certified mechanic will get this resolved without any further nonsense. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

Car won't start after running out of gas?

Hi There, It sounds like you may have had a faulty fuel pump prior to running out of fuel. Unfortunately, it sounds like you may have a faulty fuel pump that may have been damaged as a result of running...

Front wheel rumbling/rattling noise at consistent speed, or when accelerating hard and letting off of gas...

If the sound is a bit of a clunking or clicking sound when accelerating hard, this may be related to bad CV joints. What you are describing sounds like a failing CV joint. A CV (Constant Velocity) joint is a...

Car makes knocking noise then turnsoff

Hi there. This issue could be caused by multiple system or component failures, ranging from fuel system parts or ignition system component failure. It's probably a good idea to have a professional mobile mechanic come to your location to complete...

Related articles

Understanding the Oldsmobile Oil Life System and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Oldsmobile Oil Life System indicates when and what service your car needs.
Oldsmobile Certified Pre-Owned (CPO) Car Program
If If you are in the market for a used Oldsmobile vehicle, it may be that you have considered a Certified Pre-Owned, or CPO, vehicle. CPO programs allow owners of used cars to drive with confidence, knowing that their vehicle...
P2097 OBD-II Trouble Code: Post Catalyst Fuel Trim System Too Rich Bank 1
P2097 code definition P2097 is a general OBD-II diagnostic trouble code that indicates a fault with the post catalyst fuel trim system...