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Discussion Starter #1
My 4.9 just started running rough when I stop at a light. What's the most common problem. Thanks.
 

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Discussion Starter #3
most likely needs a tune up. In my day it was plugs , points, and condenser. What else besides plugs with this '93. 4.9 Sedan deville?
 

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2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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Well, it has electronic ignition, so basically, the plugs (make sure you get the AC Delco platinum), distributer cap and rotor and the spark plug wires. That should get your ignition system to last another 100k miles. Besides that, I'd check to make sure the throttle body is clean.
 

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Discussion Starter #5
Car has 74k on it all original. everything under the valve covers shines. Probably never has had the plugs changed. I'll check it out. Thanks.
 

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1989 Sedan DeVille is now just a fond memory ....
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Yes, be sure to clean the throttle body too, that will help tremendously.
I'm going to move this thread to the HT4100 (4.1) | 4.5 | 4.9 forum, I think it's a better spot for it.
 
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