I have a 2004 Chevrolet Trailblazer. Why is it shaking and it turned off? I had the air conditioning
on an when i got off the freeway and stopped at a light thats when it starts shaking and also
turned off please help.

Your truck stalling when coming up to a stop is a very common problem of carbon in the throttle
body. You need to
clean the throttle. Carbon buildup prevents the electronic throttle from being
able to control the idle, especially with the A/C on, or turning at slow speeds. After cleaning, let
the truck, start it up, rev it a few times to clear the cleaner out, then let it idle for 5 minutes, turn it
off for 1 minute, then let idle for 5 minutes. Shut it off again, then take it on the expressway.
When you get off, come to a stop and let it idle in gear for another minute. This should reset the
idle. If not, a scan tool hooked up tot he computer will be needed to relearn the idle.

GMC Envoy 4.2 L 6cyl replaced the
GMC thermostat but the lower hose is warm but not hot. The
upper hose is hot what dose that mean?

Make sure that you bled the air out of the cooling system. It can take quite some time. After it
warms up with cap off, take for a drive and do a few hard acceleration. You should hear air  /
coolant sloshing throught the dash heater core. Then shut it off and let it cool down. This will
usually bleed the air.
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Chevy Trailblazer Shakes And Stalls- GMC Envoy Thermostat Replacement
Live Chat
Question: My 2008 Chevy Trailblazer will not start. I believe it is a computer problem.

Mechanic: What is the truck doing? Does it crank over when turning the key?

Yes it just turns over. I wait ten minutes and I get lucky and it will start. It has gotten worse the last couple of days and now it will not start
at all. Just turns and no go.

OK. Well, you would need to find out if there is adequate fuel pressure first. If so, then the next step is to see if there is spark to the spark

I took gas down the throttle body with a spray bottle. So it was primed still no start.

OK, then my guess is that there is no spark. If there were, it should have tried to start at least after pouring gas in. That could be a faulty
crank potion sensor or yes, the computer.

Thank you appreciate your help.