Well, a new O2 sensor fixed my problem...

[doubt at inwave.com (Nate Mellom)]

Check your mixture (you'll need to fabricate, buy or borrow a DPR test 
harness) and check to make sure your coolant temperature sensor 
connection (on the back of the head, towards the firewall) is clean and 
tight (I sanded mine to get to good copper).  These were the 2 things I 
managed to track down on my car, it ran like complete ass for a LONG time.

Good write-up on the mixture test:
http://members.dslextreme.com/users/vwtuning/vwtuning1.html

I have a DPR rig I can loan out if you need it.

Nate


John C. Worden wrote:
> but, I still have a kind of "burbly" acceleration.  It hesitates, but 
> not nearly as bad and without the shuddering it had
> before the new O2 sensor.  I will check the cold start valve and all the 
> injectors spray patterns.  Any other thought here?
> It's on the '88 16V btw.
> 
> 
> 
> John C. Worden
> Bucksport, Maine
> 
> ''98 Dakota 4x4-
> '88 Scirocco 16V-
> '86 Scirocco 8V-Now a 16V!
> '78 Scirocco Brazil Brown Metallic, 4 speed.- In the Rotisserie and 
> under restoration
> '89 Polaris Indy Deluxe
> 
> 
>