84 S10 blazer.2.8 running rough. Varajet 2 needs rebuild but running... stalled and no start. starter has had the overheat issue but has been fine in the cold weather. so no usual click or drag when turn key 2 start. all acc. working with key on. would the ignition switch allow acc to work but not fire starter? and is there a trick to droppin the starter? damn tight! doya hafta take anything out of the way 2 switch out starter? should i use OE starter or hi torque replacement starter?

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.

I would start by changing the fuel filter. Run some injector cleaner through it. And check for more of those rotten lines. You can check by spraying a little starting fluid around the vacuum lines. Be careful though. Its flammable. But the engine should speed up if you have a leak.

sounds like the starter is being heat soaked . put a heat shield between the starter and the engine block

CK FOR A VACUM LEAK. IT SHOULD BE FAIRLY EASY TO FIND. YOU SHOULD HEAR A WHISLING SHOUND WERE THE LEAK IS CK ON THE BACK OF THEINTAKE MANIFOLD THERE IS I VACUM TEE THAT FAILS OFTEN. HOPE THIS HELPS BILL

did you happen to solve your issue? sounds exactly like what my s10 started doin a week ago

no its not the crank sensor if it were your car would not even start. your problem most likely is the idle air control valve, try removing it and and cleaning it if it does not help it will have to be replaced.

Sounds like you have a bad spot on the starter armateur...and will need to replace the starter.

If its the original, and you have over 50K miles then its probably a safe bet that your starter is bad, and will fail totally soon...if thats not the case now.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Your 84 wiring harness is for the TCC ( transmission converter control) system.
On the left side of the carburetor (driver side) you should have 2 cables, one for the accelerator and the 2nd for the TV (throttle valve) control. You will need to adjust the cable for correct shift points. Under normal circumstances you will have 7 to 10 mm's extending beyond the cable adjuster block.
Should take care of the issue for you.
Let me know.
Regards,

tps sencor or maf sencor

have you checked the fuel pump? mine would shake rough then stall... i doubt it is the tune up but check the fuel stuff