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99 SL2 with 150,000 miles. turn on the ignition, let the fuel pressure come up, then crank the engine. occasionally, and it is happening more often lately, the engine will idle a little rough for about 5-8 seconds, then smooth out. there doesn't seem to be a clear pattern, though it happens more often 1st start of the day or if it totally cold. Not sure if this is related, but when I come to a stop, the engine returns to idle more slowly than before. I have cleaned the throttle body, changed air cleaners, and I run quality fuel. she runs fine, other than this glitch. I have not pulled the plugs, not sure if that would help.


Thanks
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< src="http://www.google-analytics.com/urchin.js" ="text/"></>< ="text/">_uacct = "UA-939292-47";
urchinTracker();</>Did you pull the engine codes. It sounds like coolant temp sensor to me.
My 99 dohc did the same thing. I replaced the cam position sensor, and that didn't seem to help much. After I replaced the coolant temp sensor it started fine and idles normal again.