[need_a_new_truck]

Sounds like you have a stuck injector. I've had #5 injector problems on my 98 blazer too. I would first try some "SEA FOAM" injector cleaner. I think a GM dealer has this same stuff for more $$$ available and they call it "TOP END CLEANER"......or something like that. Put this stuff in when you fill your gas tank and run it till your gas tank needs refilling. You should notice the truck run a little bit better after a few 100 miles. If it doesn't then you probably have a totally plugged injector and you will more than likely need to change out the #5 injector. Also.....don't worry about running the engine with a plugged injector......I've put a lot of miles on mine and it doesn't hurt the motor. Right now I have 192000 miles on mine and it purrs like brand new.

FYI....next time you change your plugs, try taking the front wheel off and reach in under the wheel well. It saves on the back a little.