Chevrolet Trailblazer Questions

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I changed spark plugs my engine sounds horrible and engine light was on. I had a mechanic buddy hook up his diagnostic and my engine is misfiring in cyl 5 and 6. After driving it a little we hooked it back up and then it was only misfiring in cyl 5. The next day I drove to town and it did fine until heading home then my check engine light started blinking only after accelerating over 20 mph and has a bad odor from exshaust... Its been a week now and its still doing this?
It has a front seal leak
Now there is an engine light with an arrow in the middle that comes on

What is that?
Can I drive it to the repair shop etc
i checked the bulb good and i checked the fuse good also
what would cause this to happen and i also have no power to rear vents/tempeatures also.
now it will turn over and sometimes it will act like it is trying to start replaced the fuel filter still no goo does the samething I can hear the fuelpump kicking in. while it was in the shop the battery went dead and they let it set for 2 days without the battery
I think it has something to do with my tailgate because my backwindow wiper quit and my rearwindow defogger also quit working.I have no warning lights! Please give me some ideas!
A/C blows in back, but not in front. Gradually showed irregular operating patterns...high fan still blowing after engine was shut off...then no fan at all up front. The back wasn't blowing, but now is blowing.
I checked bulbs,replaced bulbs,replaced power to tail lights.
I replaced it and three weeks later same problem.clutch not... releasing after car warms up.pulled out the fan relay and after a few seconds the clutch releases and car drive's great but my engine LIGHT is on because i pulled the relay.I don't believe that the church is bad cuz the clutch does release when i pull relay.I'm thinking i may have a wireing problem.I have a 10year warranty on the new clutch if i need to replace again.please does any one have an idea what i can do.
Have to push and pull out a lot to get it to lock in and to exit the seat belt have to push the button 4-8 times to get it to eject.
I recently took my 2005 trailblazer to a dealership for pricing towards another vehicle. The question arose concerning the scheduled maintenance of the timing chain and if I had it done. I was not aware that a timing chain had to be replaced unless there were problems with performance related to the timing chain. Is this a scheduled replacement at 50,000 Miles?
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