Ive got a 93 pickup 3.0 where can i put sea foam besides in gas? is it ok to put where you pour oil in this truck? thanks.

Yeah, it can go in the oil and through the PCV valve or the brake booster hose. It's advised if you put some in the oil, don't leave in it there for more than 500 miles and you should also change the spark plugs out too.

I would advise against doing this. Any dirt it frees up, might just get stick inside some oil passage and cause big engine damage. It's not going to fix anything anyway.

Would this be the same for the PCV valve or the brake booster hose. What about the vaccum line? Or are you saying that in any of these areas something my get trapped inside an oil passage.

Sort of. If you suck too much sea foam into the intake, you will get liquid in the cylinder. Liquid does not compress and this will put a large amount of stress on the piston, rod, and crank. If you just put a little bit in, then the SeaFoam will only be in the engine for half a second and mostly in vapor form. So is it going to do anything in half a second? Nope.

If you want to clean something, take it off and clean it. Anything next to that, is a waste of money.
I have the same engine as yours with 400k on it. Still gets better then EPA MPG. At 300k I took the injectors out and had them professionally cleaned for $25 each. Even with 300k on them, they were in good shape before the cleaning, and like new after. No injector cleaner needed and I know it works.

I for one believe in SeaFoam, but I probably wouldn't do it on an older or higher mileage vehicle. With that said, below are a couple DIY threads to help you out if you indeed decide to do it, good luck!

http://www.customtacos.com/forum/showthread.php?t=101166
http://www.customtacos.com/forum/showthread.php?t=79051