94 Blazer wont start when hot

Hi all. I have a 94 S-10 Blazer that wont start sometimes when it's hot. Engine turns over just fine, it just wont fire up. Checked for spark, thats fine. I am getting gas, too. Is there some valve or something that can cut off air to the engine if not working properly? When it does this, it's been driven to operating temp and then turned off (to run into the store, etc.) I live in Minnesota and I didn't have this problem all winter, it just started cropping up since the weather has gotten warmer. The fuel injector assembly has been replaced twice in the last 3 years, so I hope it's not that again! I have the 4.3L 6-cyl, engine code W, 4 wheel drive. No check engine light comes on, no codes get stored. I'm sort of at a loss. If I wait long enough, the engine will eventually start, but the wait time seems to be getting longer. Any insight would be greatly appreciated.

i have the the same problem and i am still looking for an answer and was wondering if u had the answer for that? please email me at [email protected]

Are you sure you're getting fuel? Double check your fuel pump. The symptoms you describe are exactly like what my `90 Blazer was doing and that's what the problem was.