First off, thanks for helping out a newbie on the forum here... I just bought a 2005 Trailblazer with 155,000 miles. I had trans flushed and mechanic said it needed a tuneup. It was running very well but had a bit of a rough idle. I had to get it smogged for ownership transfer (thanks CA), so I wanted to do the tuneup prior to. When I pulled the plugs I found a small amount of the infamous oil in the plug wells (have since learned from your forum about replacing the valve cover gasket, we'll tackle that one day). I replaced the plugs with AC Delco Iridiums (as also recommended). When I started back up, the idle was exactly the same. A mechanic on a paid site I've used before suggested I do a wet/dry compression test and clean the throttle body. I did the test and posted the numbers for his review (which all looked good). Cleaned the throttle body by removing it completely and using throttle body cleaner and a toothbrush (it was extremely dirty). I had the battery disconnected for about an hour, and also pulled the two PCM fuses during that time. So... Reassemble, and now the thing wont start.... Cranks, runs for 3-4 seconds VERY ROUGH, and dies. I can do that till the battery goes dead... I pulled the plugs and found there was oil on them from the wet test day before. I tried blowing out the plug wells with air, cranking motor without plugs to try and force some oil out, and cleaning the plugs themselves with carb cleaner. I reinserted them and still the same problem. The mechanic that recommended the wet test has no recommendation now, so here I am, HUMBLY asking for some expertise from this site Should I toss out the $60 worth of new plugs and try putting in my old? Is this more than likely a problem with the throttle body now that I cleaned it? It was running very well (minus the slightly rough idle) before this mess.... Thanks!!!