Robslexus

98 GS 300 -- might add that after engine is off for about 1/2 hour the problem goes away. If engine is stopped and started while it's still hot, the idle stays very rough.

After about 20 minutes from cold start idle is very rough. Bad sulfur-like smell. Also, when traveling at high speed and taking foot off gas, car jerks. This problem doesn't happen all the time. I've tried to correlate to wet, cold, hot, humid etc. weather and it just seems like a random occurance. It is happening more and more frequently. Is there something to adjust? Help