I have a 93 S-10 Blazer with a 4.3 vortec engine. When started it surges about 6 times then goes to a steady idle with a slight miss. also after sitting at idle for a few minutes then try to take off it spits and sputters till I get upto speed.

Troubleshooting a Blown Head Gasket (GM 4.3L, 5.0L, 5.7L)

troubleshootmyvehicle.com > GM > 4.3L, 5.0L, 5.7L

Mar 28, 2011 - There are so many ways to test for a blown head gasket on your 4.3L, 5.0L, 5.7L GM van (or mini-van, pick up, SUV) that it can get confusing.

Chevy Blazer Coolant Leak (Intake Manifold) - YouTube

? 4:33
https://www.youtube.com/watch?v=SC4VXdt5wiE
Oct 9, 2013 - Uploaded by eyetotheworld
I have localized a coolant leak on my 2003 Chevy Blazer to thegasket of the intake ... Turns out that this is common among this particular engine both in the v6 & v8 sizes. ... The guy has been generous to detail his projects. ... 98 S10 Vortec V6 4.3 IntakeGasket Replacement Part 1 of 5 - Duration: 18:17. by ...

Chevy 4.3l v6 oil leak issue 2001 Xtreme Blazer - YouTube

? 6:11
https://www.youtube.com/watch?v=Y8Ogd5voIYs
Nov 12, 2011 - Uploaded by smiatacz
This darn little engine just keeps going. ... I have a 2003 chevy blazer and the oil cooler line from the oil filter to ... I have a 95 Chevy s10 v6 vortec 2wd that is slightly dripping oil out of agasket ... I'm having same problem 2001 Chevy Blazer 4x4 (not xtreme) not sure if those same bolts are missing on mine.

IAC idler air control valve bumps up the RPM and doesnot let the engine to die, how ever if its not the IAC then Ide be looking at the TEMP sensor which migh have a fair line crack or may be the MAF mass air flow sensor might be bad, seems like the engine is not geting air, check the air filter first.

ENGINE SURGING COULD BE WEAK FUEL PUMP, STOPPED UP FUEL FILTER,BAD TORQUE CONVERTER SOLENOID OR TORQUE CONVERTER. OR FAULTY TPS.

the one possible problem is the egr valve. If your blazer has the Vortec 4.3, the valve is located on the front of the intake manifold. You must remove the intake rubber boot on the throttle body to see it better. It's very possible that there is chunks of carbon holding the valve open. I recommend cleaning the egr valve ( carb. cleaner works great ) and replacing the Egr gasket with a screened gasket. This will take care of it stalling and surging.

Check the tps "trottle positioning sensor, on mine the idle would not stay steady, and shift so hard that it would sound like it was going to break something. it is located on the drivers side of the throttle body with a push in electrical connector.

Shakes how? While stopping? Or solely while idle, Engine light on?

If if shakes while stopping you need to check you're wheel hubs and or Suspension ,

Shakes at a light, You may have a bad fuel Injector, Check you're psi in you're fuel pump, A TPS would cause low idle or sometimes high idle, With low idle and a bad motor mount it would shake,

I know theres a few things I'm missing but,.. I have a major Headache atm so I'll get back to you with some more, when i can think better. :)

looking from the top front.

may be intake manifold leak also check fuel injectors they may be clogged

my 96 blazer would have random missfires.... sometimes more than one cylinder at a time... there are a few things to try.... 96 vortecs still used distributor caps... but they had such a high intensity spark that they were well noted for frying distributor caps and ignition coils... i would start there... also a few times i had to replace the crankshaft timing sensor.... it could be something as small as a spark plug wire... i would start with the ignition before spending money to check the fuel system

you need the firing order?? it is 1, 6, 5, 4, 3, 2 clockwise. Number one on cap is forward position, or 6 o'clock position, just left of the hold down bolt.