Starting problems and wont stay running

ok Hello I am new here i have a 93 S10 Tahoe XCab with 2.8V6

well it just started having problems it will start and just die after few sec..

I check the injecters and they spray untell something turns them off

what could be making the injecter turn off after few sec...




thanks
Nurvcom

Find the Assembly Line Diagnostic Link (ALDL) at the lower portion of the dash to the right of the steering column...it's the connector for checking Trouble Codes. Maybe the computer "remembers" something to lead us to your problem.
Jumper the 2 top right holes with a piece of wire or even a paper clip then turn the keyswitch on. The Check Engine light should flash once then 2 times...1-2 or what's refered to as a condition code 12 which is the computer's way of letting you know it's now in diagnostic mode and is preparing to flash more lights in 2 digit sequences. It'll flash each one including the aforementioned code 12 three times. After it gets through, it'll flash the code 12 again letting you know it's played all the stored codes.

ok i did that and did ~~~3 ~~~~4 like few times and start 1 2 thing agine

~= flash

i reset the truck and got this after chnageing few hose around i got ~~~ 3 ~~~3 code

Code 33...MAP Sensor signal voltage high-low vacuum

Code 34...MAP Sensor signal voltage low-high vacuum

If it's reading low and high, I'm thinking the MAP sensor is bad or maybe the vacuum line going to it has a split or a leak..

ok i just got new map Sensor and check all lines and replaced them if they where cracked or anything but truck still wont stay on it starts but something turns injecter off after 1 to 2 secs