its a bypass tube i believe. i bought new 2jz O-rings never had trouble. if you are trying to use generic O rings they will not work... at least the way they should. they are more round and less flat like the toyota o rings. never had leaks from there whatsoever once i installed new orings.
so you have a BHG and still drive the car? you haven't fixed it yet? if so that is your problem... loss of compression in the engine will hamper power.
oil could be preventing spark and running on less cylinders. usually oil on the spark plug is some seal letting it leak.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=32
check cyl head covers and the PCV. (cheap parts to replace but kind of a PITA to get to )
there is a...
every day i eat...
Oatmeal
pork
chicken
very little beef... (i cut up a cow a few weeks ago i can live without it for a while, pig doesnt bother me as much i'll eat snout hoof and brain :P)
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