I have a 2002 Chevy trailblazer and after I shut the engine off after running for awhile, it drips gas for about 5 minutes then stops. It seems that my situation is very different from other people's.

SOURCE: 2002 Chevy Trailblazer Engine Codes

This is actually an easy swap out. Remove the electrical connection, remove the retaining bolt and pull out old one. I believe the sensor is located in the front passenger side of the engine on this particular model.

SOURCE: 2002 Chevy TrailBlazer Service Engine

This one is easy. The clutch fan is not disengaging. Mine does the same thing after it has idled a while but then will release (wind noise stops) after getting up to speed.

SOURCE: Chevy Trailblazer 2003 ran the battery down now wont idle

try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

SOURCE: 2002 Chevy Trailblazer running rough when idling,

clogged injectors I bet with the dirty fuel you claimed you had in the tank. Cleaners will not remove all contaminates in injectors for they tend to get seized inside of them