I picked up a 1997 S-10 with a 4.3 v-6 vortech engine. It is an automatic and when it is cold runs rough and has a miss to it. When it reaches operating temp it runs like a top. Wondering if anyone has had this problem and what was your solution? It has head and intake gaskets already.
Thanjks for the help in advance! 
when you gonna be up Everts again ? I can put my scanner on it and give you a better idea of the problem., it could be injector pack or distrib cap and rotor plug wires ect…,I could go on and on but the scanner will show how things are running. How long ago were the gaskets done and did they use factory GM ones? 
the 5.3 vortech’s had issues with mass air flow sensors causing these problems, and also faulty intake gaskets.
both caused issues like you described.
mass air flow sensors mine did the same last year
For starters I would do some normal maintenance if it has not been done yet. New ac delco plugs and wires. New air filter/ fuel filter(don’t get a cheap one) My 97 s10 with a 2.2 ran like crap until i got new plugs and wires and fuel filter, but don’t buy cheap ones from fleet farm like I did, cause they go to junk really fast. And clean the MAF sensor with MAF sensor cleaner.
Does your check engine light work? I am thinking after driving it yesterday that an O2 sensor is bad, She ran just like my Blazer did when the O2 sensor was bad or wet.
Check engine light on? Get codes checked if its on. If no codes I would start with tune-up parts. If you replace anything go OEM parts. Post if you have codes that would help.
if plugs and wires haven’t been done in a while that could be the problem! had the same issue with my suburban and that seemed to fix it along with a cap and rotorbut if there is a check engine light on there could be more to it than that!
Quote:
when you gonna be up Everts again ? I can put my scanner on it and give you a better idea of the problem., it could be injector pack
If it was injector pack wouldn’t run that way all the time? When it warms up it runs like a top. When are you planning on being at Everts?
Quote:
mass air flow sensors mine did the same last year
He put one on before I got it.
New:
Cap
rotor,
intake gskt
head gskt
mass air flow sensor
cat conv
plugs
Will be installing genuine gm cap, rotor, wires and plugs.
No lights on at this time!
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