1998 Cadillac SLS Engine rough idle/surge

1998 CADILLAC SLS
155,000 MILES • V8 • FWD • AUTOMATIC
Avatar
D_MAN1960
  • MEMBER
  • 1 POST
When I start my car it sometimes runs rough. Not all the time, though more often than not. When it's in park it seems to idle better. When at a stop sign in drive, it will be fine then sputter like a murmer then go back to normal, then sputter again. When driving on the freeway, it seems like it's not getting enough fuel but when i step on the gas it seems fine. When I put it in neutral, it runs like a champ!

Someone mentioned to me it could be clogged throttle body, or even plugs, wires. I changed the fuel filter thinking it might be the problem, but it wasn't. Any ideas? How do I run a code check?
Feb 6, 2009 at 11:15 AM
Advertisement
Avatar
FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
Sounds like a secondary miss due to arcing wires/cracked or worn plugs. If the wires still have cylinder #'s on them they are original. Check the coil terminals that the plug wires connect to, any sign of corrosion, replace the coil for that pair as well.
Feb 6, 2009 at 11:02 PM
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.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.