Having problems with your 2003 Pontiac Montana ?
Rough idiling. Sputters but wont stall when put in drive. Computer said mis fire on 4. Changed coil and plug. Computer shows nothing now. Same problem.
It could be a problem with the injector for that cylinder(dirt or electrical).how are the other plugs do they need to be replaced.
Repair Help & Product Troubleshooting for 2003 Pontiac Montana
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.