i have a 1991 chev s-10 blazer i just did a tune up on it it and i have an intermentant miss fire now i checked the wires again there fine i just want some ideals please n thanks.

 

do you have service engine soon light on? If not, how is your rotor/distributor cap? If your ses light is on....I spent tons of time and money trying to diagnose that problem...it turned out to be my oxygen sensor on the passenger side pre-catalytic converter.

 

Cant say for sure in your case... or any other specific case , but..
Same applies to your truck as to 2nd gens. Use cheap wires/plugs/cap /rotor expect problems.

For instance, I can induce random no-load missfires in my tbird just by installing Bosch platinums the book call for.
And have done a couple times.