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engine misfires can be from ---low fuel pressure--- faulty injectors---faulty injector wires---HT leads touching each other--Leads ---plugs--- air /fuel mixture wrong from leaks in manifold and dash controls hoses--wiring to the cam/crank sensors loose /dirty connections.
Its the same as a chevy v8 pull radeator fan water pump lower crank pully loosen oil pan bolts align timing marks crank mark at 12 oclock cam cshaft mark at 6 oclock replace with new gears and chain timing cover gasket crank seal and water pump gaskets
If the starter does crank the engine but it wont start, you need a new fuel pump. The pump is cooled and lubricated by the fuel in the tank and on chevys running the tank empty almost always results in burnt out fuel pumps.
Many people seem to over look and understand that the battery is the mastmind behind this no start condition.
I would suggest that if you hear a clicking noise while cranking ( attempting to start) the engine; that you have a certifided tech inspect the charge of the battery.
This could also be , if it becomes something major, a no fuel condition. Meaning; your engine is not recieving fuel to combust.
Or a no spark condition which means that your spark plugs are not igniting your fuel.
But not to worry the problem could be your battery.
try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.