AMPM64

I'm new here but my 96 siera I bought 6 years ago I was told the timing chain was bad and I could have it for 500 so I bought it for reasons that have no bearing here the truck sat for 5 years I've replaced the chain and gears and nothing I thought maybe I was off or out 180 neither of these were the case the chain and gears I replaced were probably fine so someone said cap rotor...... When I pulled the cap the rotor was missing the center rounded portion of the conductor aha I thought obviously right but no so I ordered a cap cause I'm on SSI and hell yeah baby we got fire and actually runs great til she gets a little warm then she kicks and bucks and misfires like something just ain't right someone says o2 I have no reader I guess I could take it to O'reilys up the block any other ideas before I have to start throwing money I ain't got at her