Hey not to sound like a jerk, but that electronic gizmo won't tell you much
about your injector.  You need a quality scope and the ability to comprehend
the waveform.
Barring that, the shotgun approach is your best option.  Change parts until
it runs right.  Assuming you have spares..
And pattern test the injectors outside the manifold if you can.
BTW- Even if you had the injectors serviced, an injector coil could still
fail at any time.  I have seen a lot of this on 90's vintage cars recently.

Also don't forget these crusty wiring harnesses are at the fail stage in
life.  Don't take anything for granted on a car this old.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
John Rodgers
Sent: Sunday, September 28, 2014 4:56 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Ignition - 2.1L wasserboxer, 1991 Carat

Engine sounds and shakes like it has a dead  cylinder. I had new plugs
installed and went thru the entire ignition system and all ran perfect -
idle and at 3000 rpm per Tencent. Even put in new ignition wires because
testing them with a timing light can be faulty. My Shoebox Electronic gizmo
shows the ECU  fuel injector pulse proper - but tells me nothing about each
injector. The injectors were cleaned, serviced and tested Cruzin a year or
so ago. Seemed OK. I have'nt pulled and test them yet for lack of  seals.
So it is yet to be done.

Except for the injectors, I am stumped! Any one have any ideas or
suggestions. I'm all ears!

Also -  could anyone tell me the proper plug length to  be screwed in to a
cylinder head.

Thanks

John the Gimp