Serviced injectors are supposed to be used within 3 months of being serviced and stored In a sealed bag.....
So one that was run than sat for 5 years is far from serviced. That's extremely suspect. 

I trust rebuilt bosch injectors over the brand new Chinese auto zone ones all day long. I have a great injector guy that does great work if you. House to send them out ( which I suggest anyway, for any wbxer, even those running "well"). 
Yes, they gum up from sitting, even on the shelf. 

-craig

> On Oct 15, 2014, at 3:29 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
> 
> Compression - leak down test then try swapping the injectors if you know which cylinder is miss firing.
> 
> Dennis,
> From my phone.
> ________________________________
> From: John Rodgers<mailto:jrodgers113@GMAIL.COM>
> Sent: ‎10/‎15/‎2014 1:07 PM
> To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM>
> Subject: Dead Cylinder -91 Carat - 2.1 L WBX
> 
> Heres the deal. Feels like one cyinder is dead -until it reaches near 2000
> rpm -then it kicks in. Put a load on as when going up a hill and that
> cylinder drops out -once again it feels like its running on three
> cylinders. Using my ECU Monitor, the ignition path is good to the
> distributor. From the distributor to the plugs checks good with a strobe
> and I get a good, strong spark at the plugs themselves. Still no joy!
> 
> The only thing left(not counting the AFM -and I get a good signal from it)
> is the throttle body and the injectors themselves. I don't think this is a
> throttle  body problem because the air flow would be the same to all
> cylinders. The last item on the list is the injectors. The injector pulse
> is good so I suspect a bad injector,  plugged or partially so. Yet there is
> only about 25 miles -but about 5 years of sitting idle and never running
> since the injectors were serviced just  before it was parked.
> 
> Would anyone else think "bad injector" as well?
> 
> Would appreciate any input or comments on this.
> 
> Thanks,
> 
> John