[2005chevimpala]

I changed my oil last night,as soon as i start my car the engine is noisey on top,sounds to me like a dead spark plug or wire,when i rev her up the rattle gets louder,if i really rev her up then she cuts back down almost cutting out completely and returns to normal idle like there is nothing wrong,how can i try and fix this myself,should i buy one plug and change it out in every cyl to see if it corrects the problem,looks like i may have major trouble might just be a coincedence that after i changed my oil then she rattles and miss fires,thanks maxwedge for your input where i told you i had the hood open in misty rain and you said my plugs and wires may be wet but everything looks dry to me,i took the wires off one at a time and look dry,if i take my oil filler cap off and listen inside it sounds like a dead cyl like a dead plug maybe,can some one help me out,this is similiar to my other posts i put on here last night so right now i can't drive my car,another mech told me it had nothing to with the oil change,he sais it was a coincedenace and i may have a clogged injecter or stuck injector and to get a ractchet extension and put on each of the injectors and tap light to see if either frees up,my car was on empty pretty good and was jacked up in the front to change my oil and may have sucked up a little dirt in one of the injectors clogging it,what do you guys think,too dark out now for me to try this,what do you think maxwedge,is it possible for an injector to get clogged and make the engine give multible misfires,she do sound like she is only running on 5 cly's,the code is a dtc po 300 engine misfire detected on 301,302,303,304,305,306,thanks guys need help