Skip the auto shop - Our mechanics make house calls

Q: Car starts but runs uneven, ignition module and coils replaced, battery fairly new

asked by on

vehicle starts with some slight hesitation, runs very rough. Similar Situation 6 months ago and an ignition module and coil fixed it. 2 more coils now changed and back to square one. Runs rougher with trans engaged, little movement possible. Battery is 2 years old.

My car has 204000 miles.
My car has an automatic transmission.

Hello, thanks for writing in about your 2003 Pontiac Bonneville. Make sure all of the connections the the ignition module are tight. If one of the wires are loose you will have a rough running engine. I’m sure its something as a connection problem. Your battery would not be the reason it doesn’t run good. If you’re unable to pinpoint the issue yourself, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose your rough running condition firsthand.

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
  • Home
  • Questions
  • Car starts but runs uneven, ignition module and coils replaced, battery fairly new

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: Fuel pump breaker trips.

Hi there. Check the electrical wiring from the fuel pump breaker to the fuel pump and see if there is any loose wires. When the vehicle shifts from 2nd to 1st there could be a fast draw down in speed...

Q: Electrical issues when trying to start the engine.

Hi there. The corrosion on the wiring will cause an extra load on the battery causing the battery to drain fast and force the alternator to work harder. Depending on the speaker system that you have, the alternator may not...

Q: Why do my brakes or wheels clunk when releasing my brakes in my 2009 Pontiac G6

Hello. It sounds like you may have an issue with the brake caliper no releasing or it may have an issue with the cv axle or an engine mount. Any of these will allow excessive movement or binding when releasing...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.