I really want to use the can of seafoam i bought, but i really dont want to put it through the brake booster or vaccum line or w.e. I'm afraid i will screw something up, and i dont even know where this hose line is located.

Would it be okay if i just put the seafoam in my gas tank and through the oil cap into the engine??

Also what kind of spark plugs do you guys use? I want to use 1 heat range colder(105'* i believe) but i dont know how exactly to find them. I see autolites but none of them say 105 or 106'* on them.

Putting seafoam threw your vac lines should not hurt anything. You will need to change your oil after you do though. Put 1/3 can in the vac line, and 2/3 in the gas tank.

Autolite 605 is 1 range cooler. 104 is 2 ranges cooler, and 103 is 3 ranges cooler. I've seen the 605 and 104 at Menards for about $2.69 a pair.

the thing is, i dont know where the vacuum line is exactly located on my car.

I work at menards and looked at the spark plugs, theres one set that says AP104 on them, are those the 104 spark plugs that i want?

I'm using the 605'* and have the 180*T. I did not change my plugs after my last SaeFoam, but I did change the oil and filter - which is a must!

If you have the SC cover on, take it off. On top of the SC is a black plastic tree with a couple of lines going to it. Those are all vacuum lines.

Do you mean the engine cover that says 3800 series II Supercharged?

That'* the one, take it off

No, you don't want AP605 plugs. They're platinums, which is the P part, and you want copper plugs.

why do i want copper plugs?

Platinum ones have been known to cause misfires under supercharging conditions. This is probably only if you drop a pulley size or do some tuning, but it is nice to be safe. Copper plugs draw out heat from your combustion chamber much better than platinum ones.