# Still a Rough Running 1990 Eldorado - Advice?

**URL:** <https://community.cartalk.com/t/still-a-rough-running-1990-eldorado-advice/37785>\
**Category:** Maintenance/Repairs\
**Tags:** eldorado, cadillac\
**Created:** [October 8, 2009, 10:18am UTC](https://community.cartalk.com/t/still-a-rough-running-1990-eldorado-advice/37785 "2009-10-08T10:18:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![oldsfan](https://avatars.discourse-cdn.com/v4/letter/o/e0b2c6/32.png) [@oldsfan](https://community.cartalk.com/u/oldsfan)\
**Post date:** [October 8, 2009, 10:18am UTC](https://community.cartalk.com/t/still-a-rough-running-1990-eldorado-advice/37785/1 "2009-10-08T10:18:50Z")

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My 90 Eldorado has a slight shake and hesitation at idle. When I am stopped at a light and then accelerate, it hesitates a second - then moves. I also feel a slight vibration- like a shaking or a miss - then the engine is fine. I don’t notice this problem at highway speeds - just at start up and from stop. I have replaced all plugs and wires, distributor, and O2 sensor. I am also running Berryman injector cleaner. Car runs better, but there is still this issue. I ran codes before replacing the O2 sensor: left and right fuel difference. The code is now cleared after installing the sensor. No codes now. Any ideas on what to do next? Thanks!