Still stumbling at high boost (5ktq)

[Beatty, Robert]

OK... i did a few things over the weekend and still getting slight stumbling
at high boost/rpm

Checked all spark plug wires.... all are reading approx 6.2 k ohms which is
slightly over the 5k stamped on them, but as they ALL are within 200 ohms of
each other, im assuming this is normal.

Checked coil wire, reads 1.2k and is stamped 1k.

Rummaged around in dads cellar and found breather hoses and other hoses that
were crappy on the vacuum system and replaced them all.

Cleaned the ISV since i had it off....

Dad suggests perhaps i have a weak coil?  Anyone have the ohm readings for a
coil on a 87 5ktq?

There is still a question of the slight amount of oil i found in the
wastegate when i changed springs, however this stumbling problem was present
before i pulled the head off and changed the turbo and downpipe.  When
re-installing I used a different wastegate so i dont think its the problem
either.

So after this weekend im left with these possible answers:

1.  spending about 13$ a plug and going to the best plugs i can get. ( i
have the correct wdt7 plugs in there now)

2.  a vacuum leak that i couldnt find.

3  a fuel delievery problem at higher boosts?  (fuel pump maybe?)

4.  Flash of INSIGHT.... could my fuel filter cause this?  i have no idea
how old it is and prolly should replace it...!!!!

ok if anyone has any ideas on what direction i should go... let me know...

Rob