I put new spark plugs and wires in my 2000 impala and it still runs rough. What could it be

185,000 MILES
Avatar
ROGER GOOD
  • MEMBER
  • 4 POSTS
Has less power than a few days ago and it doesn't heat up like it should. Is using a lot more gas too
Dec 10, 2011 at 8:15 PM
Advertisement
Avatar
SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Do you have any codes?
Dec 10, 2011 at 8:25 PM
Avatar
ROGER GOOD
  • MEMBER
  • 4 POSTS
It said misfire in #1 cylinder before I changed plugs and wires
Dec 10, 2011 at 8:31 PM
Avatar
SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Have you checked for codes since you replaced the wires etc?You say its not heating up like it should but maybe the gauge says its not heating up it actually is?Maybe you have a bad coolant temp sensor?
Dec 10, 2011 at 8:43 PM
Avatar
ROGER GOOD
  • MEMBER
  • 4 POSTS
No I have'nt. I just picked it up at 930 tonite. Only drove it maybe a mile to get home. Itheats up just takes twice as long. To get good heat out of it. Oh its a 3.8 engine
Dec 10, 2011 at 8:50 PM
Avatar
SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Usually a bad thermostat can cause extra time for the engine to warm up.Check out the thermostat or better yet just replace it.
Dec 10, 2011 at 8:56 PM
Avatar
ROGER GOOD
  • MEMBER
  • 4 POSTS
Il d do that. Just not sure what to do about the running rough. Not jst idleing but also while driving
Dec 10, 2011 at 9:00 PM
Avatar
SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
We need to start with the exact code numbers not code descriptions.We might still have a miss firing cylinder or two.
Dec 11, 2011 at 1:16 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle