200 tahoe will not start

You don't say if you have checked anything else. It could be any number of issues. I would look into either the crank sensor or the ECM as possible failures. Did you have any Service Engine Soon lights recently? Have you had the ECM checked for any stored trouble codes?

I had same problem on my 97 tahoe shut off while driving and wouldnt start only turned over. checked everything and when i replaced ignition module started right up no problem. Hope this helped and saved ya money

When you say it fires, are you checking for spark at the plugs ?
In most cases you have to figure out if it is spark, fuel, or compression to proceed. A mechanic would also check the computer for trouble codes but you would need a scanner or code reader to do that.

did you check the timing? the firing order.
does the engine rpm rev up high? if it does then check the transmsission for low on fluid or slipping.
check your catalytic converter for clogged up.

if its carberated, u need to clean that out. if its fuel injected, replace the fuel filter. if it stil dont work. then u have a fuel injector problem

sounds like an Ignition control module,check for spark immediately after it dies.the spark should should be strong even up to a half of an inch gap

the filter on fuel pump might be clogged as well or fuel pump needs replaced

Spark without fuel = just spark. :) Are you getting fuel movement? You could have a bad/clogged fuel filter, bad fuel pump - could be a few things. Check to make sure you're getting fuel.

-KC GTO Dad

check for spark and fuel at the motor! take one of the spark plug wires off and remove the spark plug and put the wire back on it and rest the spark plug on a negitive ground point and have someone try to start it and see if the is spark. to check to see if fuel is getting up there locate the fuel presure relief valve on the fuel rail that the injectors are connected to and while someone it trying to start it depress the valve and see if fuel squirt out.

You mean when you said it tries to crank but didn't, you mean start right. It did crank ok just wouldn't start?
Sounds like it could be a bad fuel pump or clogged fuel filter. You need to check to see if there is spark. Pull one of the spark plug boots off and put a nail, paper clip, anything you can inside of the boot and put it on top of your engine and have someone turn the engine over to see if there is spark to the plug wire. Let me know back what you find out.