hey everyone. i have a 91 s10 4.3l and ive been having some minor issues with it. whenever im driving its running fine. but when i come to a stop, it starts to shake a bit. i start to go and its fine. also when i give it more has my "service engine light" turns on. i replaced the egr and nothing happened. same issues. does anyone have an answer for this? i was told that it could be the iac valve. where is it located? thanks

 

The iac valve is in the throttle body.

What is the code that is being reported?

 

I have this same problem in my 91 Blazer. Another sign I've noticed is an extreme drop in oil pressure.

What I've been told is that there's a vacuum leak somewhere. Any ideas?

 

i have not hooked it up to a scanner. im going off info on the internet and what people have been telling me.

 

yea, sounds like a vacuum leak or a intake gasket leak. you can spray carb cleaner around your intake gaskets, and if the engine smooths out or revs up then you have a leak. also check your vacuum lines for dry rotting

 

You don't need to hook up a scan tool to read the codes. A paper clip is all that is required. Check out TroubleCodes.net for how to check codes on an OBD1 vehicle.

 

thanks for the tips. ill be doing both of them. is it safe to read the codes with a paper clip? ive never done that before.

 

just did a code check with your tip swartlkk. thanks for the tips everyone. it looks like its my oxygen sensor thats faulty.