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I had this problem and found the secondary air inj. pump was coming on because of corrosion. Replaced relay to it cleaned it up and so far so good. It is located under the vehicle on the drivers side almost below the seat.My girlfriend happened to hear the pump running at 4:30 am one morning while letting the dog out
On 05+ Trail Blazer, the fuel filter is integral with the fuel pump inside
of the fuel tank. It is a non-serviceable part. On 02-04s, the filter is
on the drivers side frame rail at about the B-pillar. If your trail Blazer is a late 04 which means that it was build close to the 05 Trail Blazer, you may have a non serviceable fuel filter. Good luck and check under your Trail Blazer or look at your manufactured date sticker on the door which would help you indicate if your 04 is a early Trail Blazer and you'll have the fuel filter on the inside frame rail under the driver's door.
1st check to make sure air intake is opening all the way even though most vehicles are fuel injected these days there still is a idle screw located at the air intake also you might be having clogged fuel injectors
Under the top of the engine there is a cover. Remove this plastic cover and under you will find an individual coil on each cylinder held in place by a bolt. Unplug the coil, remove the bolt that holds the coil in place and twist apull up gently to remove the coil boot. Under the coil is the plug. Use platinum plugs that are rated for about 80k miles so you don't have to do this procedure but once every few years. Hope this helps, good luck
If you haven't bought the part yet and are planning on replacing it ...i'd go to the auto parts store and ask them for the part location. They are usually glad to do this. I know Advanced Auto Parts does this for me.
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if chains caused problem and you have driven with them off light would have gone out once it saw everything working properly. look at sensors might have pulled a wire loose with chains. the abs system runs a self test everytime you start vehicle if it sees a history code from last time it will leave light on and look to see if that problem still exists and 99% of the time it will cut light off . but need to have scanned and checked out