Disclaimer.... this thread is not about the diagnosis, treatment or the adverisments of products for erectile dysfunction. I know we're all getting on but really... see your GP if that's the case
ANYHOOOOOO
I have recently been looking in to overcoming performance problems and I thought I'd pass on what I've learned and perhaps spark (no pun) debate or discussion on what to do if you encounter such trouble. It also may be worth noting that these are helping to diagnose whats wrong if there's no check engine light. Obviously if you have a fault code then you can get that read and at the very least you know where to start from. But this is mainly for the home DIYer with no codes

I think first of all that the mantre here should be not to neglect the basics, and as you go and change/do something it's really important to test over a period of time the effects your change has had on the performance so you can say that solved it, that helped a bit or that did fek all. Narrowing down your problem... I'm getting well in to diagnosing stuff

Ok, so first the basics that anyone can do would be:
1.) Check and replace your spark plugs. I find that if I'm pulling out plugs I like to keep them in order so when they're all out and if I see something not right or inconsistent with one of them I can start to narrow down a potemtial problem to a particular cylinder.
2.) Test (if possible) and replace your fuel filter. If you have a fuel pressure gauge you can test the pressure going in to and coming out of the filter. If this is restricted in any way this can cause a problem . There could be a blockage affecting the volume of fuel getting to your emgine. Replace it. Tis a serviceable item anyway.
3.) Air filter. Again, serviceable item. Chuck a new one in.
4.) Vacuum leaks. You may have heard me mention ETCG before. I love the guy and have watched all his videos. Here's one for this procedure which I like...
http://www.youtube.com/watch?v=9CPqbaSgcok+
5.) Ignition Voltage Leak. My understanding of this is that if two or more HT leads are bunched up close to each other that this can cause problems. You may also hear sparks jumping about. You can soak the leads in water and try and try and worsen the problem to make it more viewable.
This I'm a bit unclear on so if anybody out there can give us some tips on finding ignition voltage leaks go for it
6.) Power balance test. I've never done this and it probably would be difficult on the V6 but this would be pulling out each HT lead and listening for the engine to drop RPM. If it doesn't you have found the cylinder that's affected and you can check for spark, do a compression or leak down etc etc
Ok, so those above anyone can do. The next things involve certain tools......
7.) Compression test (or even better...leak down test). it stands to reason that if you have a loss or lack of compression youre going to be down on power. performing these tests will clue you in to finding out if you have a leak and with the leak down where its coming from. I'm actually going to
persuade and threaten if necessary ask my school technician nicely if I can borrow the compression tester for home. (I actually believe I have a bit of a performance prob so I am covering every angle... whilst most importantly learning how to use the tools comfidently without having to be baby fed)
8.) Scanning tool. the lovely folk on here offer their services. if they do a full scan they can look at all sorts of readings that could key you in to a particular problem.
I hope this may be of use. if ive got anything wrong please say (in a nice way

) and add your wisdom

one question i have myself is this.....
Someone I spoke to mentioned a fuel injection problem and with the car being quite old there could be a build up of shite in the cylinders and the fuel injected having a sponge effect. it was mentioned that injectors should also be serviced. thats fine too. however what could i get to remove the build up of stuff in my cylinders. is ''Engine Flush'' the thing we're talking about here?
Just whilst talking about that if anyone has anything to add on solving the problem if its fuel related would love to hear your thoughts.
cheers chaps.
Car Bear