98 blazer wont start here are syptoms

1. Turn key it fires up for a split second and then stalls
2. you can repeat this over and over
3. I can clearly hear fuel pump running

1 week ago i replaced the lower intake gaskets spider and a complete tune up since it has run flawless.until now

 

I would check for any vacuum leaks.

 

ok went to start truck this morning fired right up.

im assuming i have a passlock issue. the ignition is pretty worn

 

I was having the same prob this morning and blazer_grl told me the same thing so i checked them all and nothing looked wrong with them......after i checked them it fired right up also.....wierd huh?

 

Maybe while checking them & moving hoses around you bumped something back into place? I've done that with wires while checking something else. A loose connection can be a PITA to find but think about what's around where you were moving things, it may help. Or go over what you had moved while the vehicle is running. But DON'T mess around with wires around the coil IF it is that that's the issue. It'll make your short n curlies long n straight!