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Re: 97 Bravada intermittent misfire
Ok, just looked at the S10 and the power brake booster gets it's vacuum from the rear of the plenum. The pcv valve appears to get it's vacuum at the plenum very near #5 runner entry. I'd unplug the vacuum hose from the brake booster, put my thumb over the hose and have an assistant start the warm engine.
If the miss is still there, reconnect the hose, purchase and install a new pcv valve and retest.
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1992 Bravada, 201K, stock
1997 Bravada, 101K, stock...was "called away" 
"Cornbread Red", 2001 Dodge 2500,4X4,HO Cummins Diesel,QC,SWB,6spd.,Banks boost&pyro,US Gage fuel press.,Edge Drag Comp,4"exh.,cowl hood, bhaf, black Holley pump, 140gph...13psi WOT, Vulcan Big Line, kevlar/ceramic single disc clutch, cheapo fuel cooler, 8x.010" vco injector nozzles, Cat turbo 62-65-.70A/R, 497hp 1089 tq 8/25/14 
Time to turn so's you don't burn. 
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