2003 chevy blazer 4.3 4wd
really hard to start in morning...once running has a really bad miss and hesitation...after about half hour it seems to be running and it starts fine for the rest of the day
replaced fuel pump and filter, cat, maf, plugs and wires, rotor button, distributor cap
check engine light is on with p420 code
would that be oxygen sensor? only thing left on that code that i haven't changed..any information would be greatly appreciated
thanks in advance

1996 chevy blazer 4.3 4wd
just bought this blazer and it will fire but it stops...shut key all the way off then try again...fires but stops...
could that be the crank sensor?
really at a starting point with this one..not sure what could be wrong...any help is appreciated

had a couple people say that the crank sensor could possibly do this...any other ideas?

also it will hit with ether but then stops firing...wont stay running

thanks in advance