I have a 90 s10 Blazer 4.3 4wd it runs like **** I can disconct the batt for a min and it will run good for min and go back to runs like **** somemore It's not a vac leak and I put new plugs,wires,cap,button and fuel filter still runs like **** so here I am looking for help Thanks

It skips and acts like it's running on 5 and not 6 kind of like a vacuum leak but thats not it and the temp is high around 200 to 210. no check eng light so can't get a code disconct the batt for a min and then it runs like new for just a min or so and starts skipping and acting like it needs a tune-up It idles up and down and sometimes it just dies but it sill has power just not as much

 

Maybe describing some symptoms would help.