I sent my 1993 S10 Blazer 4X4 off to the shop to have it checked out since I couldn't get it running.

They replaced:

Spider injectors
Injectors return lines
Plenum chamber
Fuel pump
Fuel pump strainer
Fuel filter
and something "rotor air filt cap screw"?
1 1/2 quart of ATF.

I've replaced a lot of things like the drive belt, alt, starter, battery, spark plugs, plug wires.

The car has been sitting for over 2 years. It ran fine when I picked it up from the shop but once the engine got hot and I had been driving at 55-60 MPH for about 3 miles and came to a stop sign. I hit the brake and it stopped then when it was my turn to go, I hit the gas.

It didn't move. The engine didn't even rev up. It just sat there running so I had to stop and restart it but it was struggling to start and keep the idle going. Like something was clogged up. I had to give it gas to start it and keep it running then as soon as I got close to home and hit the gas, it cut off on me again and I had to power steer it into the turn.

I parked it in my driveway and started it up again but it wouldn't without giving it a little bit of gas. I was finally able to keep it idling without my foot on the gas for a few minutes.

I called the shop and they said it was just the old gas being cleared out and it needed to be driven to get the fresh gas in.

What do you guys think?

Forgot to mention that I had the AC on but the air was not cool. I turned it off at the stoplight. If that matters.

 

Certainly could be crappy gas, among other things. If it were me I'd drain the gas out of it and put fresh gas in just to be sure. If you can't drain it, I would run it through like he said. Put some seafoam in the tank, and get some fresh gas in it, and then diagnose from there.....

 

I would pull the EGR valve and check for carbon flaking off and jamming the pintle keeping it open and causing a massive vacuum leak. That may be causing the problems you're having.

 

I'd look down the EGR route as well.
A vacuum leak usually takes time (slow rot of lines) or is instant (line falls off etc), but seeing as this had been sitting for 2 years I wouldn't rule out a rotting line finally coming apart fast because it's just been ran after 2 years.

 

I haven't had a problem with it not moving under gas since then but it has been running horribly and the brakes get very tight when it's just about to cut off. Power delivery also isn't smooth when moving at low speeds or from a stop.

I really think it's a vacuum leak somewhere or a connection was missed or something along those lines but so far the visible lines I can see are on. I don't know this engine well enough, though, to tell if all the lines should be there or not.

On my Nissan, the EGR is at the back of the engine. Is it the same with this vortec motor?

 

Nope its right under the throttlebody and pretty easy to remove.

 

When you check the vacuum lines on this engine you have to check the small lines that come immediately off the back of the manifold near the distributor. There are a bunch of short (>1") lines and tees to send vacuum to the various places it's needed. Make sure none of those are cracked or leaking. Also check the long vacuum lines running back to the transfer case and the front axle 4WD actuator. Those can be a source of vacuum loss as well.

 

also get a vacuum pump and test the ball that's on the passenger side fender if its cracked and not holding vacuum that's a issue as well

 

You guys were right. It was the EGR. The hoses are fine, but the carbon buildup was unbelievable! No wonder it ran like crap. The previous owner told me that she had to get the carbon cleaned up every 6 months. Whoa. Sounds like it's time for me to learn how to clean the carbon up myself.

Can you say seafoam?

 

WTG, congrats... who needs a shop when Blazer Forum is around?! lol
I'd still check over all the vacuum lines for cracks etc. An easy way to test, is to get a can of brake cleaner, let the engine idle & spray it over the vacuum lines. If the engines' idle changes suddenly - voila you've found a vacuum leak!
I replaced mine with windsheild washer tubing... can't remember the ID of it, something like 3/16 or 5/32.