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Rough Cold Idle on a 99 SLS

Big Dan58
11-06-2006, 02:29 PM
Just bought a 99 SLS. Runs beautiful but on a cold start, it idles kinda rough for about 45 seconds, then runs very smooth. Any ideas what it may be, a tune up or bad sensor? :screwy: Hopefully something small. Please help

11-06-2006, 05:03 PM
It could be fouled plugs. You didn't say how many miles were on it.

Big Dan58
11-07-2006, 05:37 PM
I found out that has new plugs, wires and new coil packs.
It has 86000 miles

12-26-2006, 08:10 PM
I had the same issue (68,000 miles) and mine was due to a cracked spark plug. The ceramic head on two of them were cracked. I changed the plugs and wires and all was well. :bigthumb:

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