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2004 chevy trailblazer_lt
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997 Posts
Generally, starting problems after getting fuel or from parking on a hill relate to a bad fuel pump. This is certainly the first thing that comes to mind with GM vehicles. Fuel pumps will fail sooner or later; not might, but will.

Unfortunately, it is hard to diagnose over the internet unless we know lots more information on temps, trouble codes etc. There is also the possibility of a bad coolant temp sensor causing it to pour lots of fuel into the engine because the PCM thinks the coolant is cold when it isn't.

We can't fix things for people. We can offer suggestions, but sooner or later, it is up to the owner to properly perform diagnostics on the things that we point out are common problems and MIGHT be the cause.

BUT there are lots of other issues that crop up from time to time; bad batteries, bad ignition switches, dirty throttle bodies, plugged fuel filters, etc. We can't advise everyone because no one knows what conditions your vehicle is driven in. Some vehicles never get over 2000 RPM and will just atrophy. Some get driven the way they were designed but never get maintained according to the factory (not your dealer) recommendations. Some owners never use Seafoam or Techron in the fuel tank at every oil change. (This should be a MUST.) Some owners have never even heard of Top Tier gas, let alone ensuring that is all they burn. Some owners don't understand that the throttle body must be thoroughly cleaned front and rear (with throttle-body-cleaner ONLY) on a regular basis because of the way these engines were designed. Some owners change the oil every 3000 miles, thinking they are gaining "piece of mind" when all they are doing is flushing their money down the drain.

So you see how hard it is to offer diagnostics to everyone in every case.

The way to attack this is to try the easiest, cheapest and most common problems first. This means, clean your throttle body, get your fuel pressure tested and then get a new ignition switch.

By the way, don't throw parts at a problem unless you are sure it is the cause, and don't shotgun solutions by doing ALL of the above at the same time. Clean the throttle body and see what happens. If it is the same, get your fuel pressure tested. If that checks out okay, have your battery load tested. If there are no symptoms, change the ignition switch. If nothing works, THEN come back and let us know and see what we can think of.

My money's on the fuel pump.
 

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Registered
2004 chevy trailblazer_lt
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997 Posts
Let us know how you make out!

Our vehicles rarely respond to kicks (except perhaps to a slow actuator, a stuck starter or the odd TCCM that didn't 'wake up.')

On the other hand, the problems are relatively predictable, and if people diagnose logically and turn to the good folks in here for help, there is always hope. Good luck!
 

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2004 chevy trailblazer_lt
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997 Posts
Keep us informed.

Remember ... easy and cheap solutions first.

Clean the throttle body, have your battery load-tested, get your fuel pressure tested and then replace the ignition switch. (One solution at a time.)

The throttle body is an easy half-hour job you can do yourself. The battery load-test is 10 seconds at any good battery store. The fuel pressure test is 5 minutes at a garage. (GM made it insanely easy for us by installing a Schrader valve test port fitting right at the fuel filter on 2002-2004 vehicles and on the fuel rail for 2005+ models.)

The ignition switch is about $40 and you can also do this yourself in the driveway. (Follow the instructions on this forum carefully and you won't have any problems.)
 
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