Intake 91 s10 blazer vaccum like off intake, ive recently got a new aftermarket air cleaner. but havent been able to hook it up do to not knowing what to do with the vaccum line comming offf the stock air cleaner. please help

The vacuum lines on a 1987 Chevy S10 Blazer are responsible for routing vacuum to various components such as the brake booster, EGR valve, and other systems.
A vacuum line diagram for your specific make and model of Chevy S10 Blazer can be found in the vehicle's service manual or in some cases, it can be found under the hood on a decal or sticker.
If the vacuum lines are loose, cracked, or damaged, it can cause various issues such as rough idle, stalling, poor performance, or even a failed emissions test.
It's best to consult the service manual, a professional mechanic or the dealer for proper diagnosis and repair of vacuum lines issues. These lines are crucial for the proper operation of many systems in the vehicle, so it's important to fix them as soon as possible if they are found to be damaged.

yes you have a clooged injector. you can try running a bunch of cleaner through it. also could be the iat sensor(intake air temp) if you put an aftermarket intake on make sure u use the iat on the new duct work. id do the cleaner and the iat sensor and that should be good also check for other vacume leaks from hoses and from egr valve

Vacum diagrams should be under hood on hood or radiator support alsi in repair books at parts house

They probably had your air filter out, 1st check the intake tube & vacume lines on the air cleaner box & intake tube. Make sure the clamps are tight & all vacume lines are on

the vaccum comes off of the intake manifold behind the throttle body.

oil presser sending unit bad

try checking air cleaner box to be sealed or dirty air filter and try to clean mass air flow sensor also check for dirty air intake only clean mass with special mass cleaner . also look for vac leaks and fuel pressure .

It it is TBI (you can see the injector once air cleaner removed) use a torx socket and remove upper plate to TBI unit. If you cannot see the injector it is CPI. Must remove upper intake to access injector.

some vacumn lines only **** air when the antifreeze warms up,i would check either EGR valve or EGR sensor,then the fuel pressure regulator,but if you think its a vacumn issue,then spray carb cleaner around the throttle body and lines

The IAT or MAT sensor (as equipped), is a thermistor (resistor which changes value based on temperature) mounted either in the air intake snorkel or the manifold (depending on the application).