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The rotten egg smell if it is coming from the exhaust is a very good sign that you catalytic converter has failed or is failing. but a bad or battery that is being overcharged can also make a rotten egg like smell.
the rotten egg smell indicates the truck is running very rich which will cause it to shake at idle.you need to have it put on a scan tool to see what the readings which will help to diagnose faster.you could have too much fuel supply because of an injector problem a plug not firing,plug wire,problem with the pcm,too much fuel pressure in the system a sensor sending the wrong information to the pcm.
if it shakes and smells of rotten eggs, then the catylitic convertor is bad. driveability symtoms are--- lack of power, drop in fuel economy, lack of high speed power, rough idle or stalling are the symtoms of excessive back pressure. due to a plugged up convertor. it should be diagnosed by a mechanic to verify this.