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My 1994 S10 started idling & running rough about 1 month…

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Hi my name is***** 1994...
Hi my name is***** 1994 S10 started idling & running rough about 1 month ago. It starts easily but runs rough. I can see the tach jitering on idle. In neutral it will rev. up to 3000 RPM(and higher) and seem to be running pretty smoothly. Returning to idle it runs rough & sometimes when I shift into gear it will stall. I've taken it to my regular service center & they told me they would try a new EGR valve.That didn't help and they didn't charge me. . What are your thoughts?
Submitted: 7 months ago.Category: Chevy
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1/14/2018
Chevy Mechanic: rpmdiag, Tech and Instructor replied 7 months ago
rpmdiag
rpmdiag, Tech and Instructor
Category: Chevy
Satisfied Customers: 9,108
Experience: Since 1975
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Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

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Chevy Mechanic: rpmdiag, Tech and Instructor replied 7 months ago

You should start checking for vacuum leaks first internally and externally with a smoke machine unless you see an obvious hose off somewhere. Also check the idle speed motor on the throttle body.

Please understand that I don't know your skill level or tools
you have to assist us. Also understand that I can't see, smell,
hear, or touch the vehicle either, so your patience is
appreciated. JA is a great Q/A site, but it does not replace a
repair shop. So please don’t shoot the messenger if I have to
deliver bad news:)
If you are satisfied with my answer, I would greatly
appreciate a 5 star rating now before you leave the site and I
will still assist you after you have rated me too if another
question pops up. I don’t get credit for helping you until
you rate me

Thanks, Ron

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Chevy Mechanic: rpmdiag, Tech and Instructor replied 7 months ago

Did you have any more questions for me at this time?

Thanks again, Ron

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Chevy Mechanic: rpmdiag, Tech and Instructor replied 7 months ago

Thanks again and please remember to rate me 5 stars now
and keep this link in case you need me again later on.
I don’t get credit for assisting you until you rate me
My goal is to assist you in the repair of your vehicle by
supplying you with well educated information. I may not
always have the exact fix you wanted to hear, but my job is
to get you on the right track, which I always do. I can’t hear,
see, smell or touch your vehicle from where I’m at, so your
understanding of that is greatly appreciated. There are no
magical answers, but I do my best to guide you in the right
direction.

Ron

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