Ok plugs have been checked and are gapped corectly. When I got the truck the plug wires were a mess. One of the first things I did was route them like the TSB says. IAC has been replaced. Problem is still there. Light throttle and it will buck kinda. Doesnt do it all the time however. I also noticed its poping out the exhaust now too. Looks like the plenum gasket was just recently done, theres no oil pooled up in there and the intake has new gaskets on it. Also the more I look at it the truck appears to have one new head, Im thinking one was cracked at some point. I say it looks newer because one head is rusty and the other is rather clean. Like I said it idles fine, doesnt run hot, make good oil pressure(little over half way mark). The truck runs real good when it isnt stumbling, and it doesnt do it all the time. Itll be fine, then do it then, it will be fine again. Its really buggin me now. Any other ideas?
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