Off-idle stumble resulting from ported EGR

[Steve=Ravet%Prj=Eng%PCPD=Hou at bangate.compaq.com]

lusky at knuth.mtsu.edu (Jonathan R. Lusky) Wrote:
| 
| 
| Steve=Ravet%Prj=Eng%PCPD=Hou at bangate.compaq.com writes:
| > I've seen this exact problem in two '86 4x4 S-10 blazers (3.8 
| v6?) and an '88 
| > corsica (also 3.8 v6?).  I never thought it was related, but 
| now I wonder.  
| > This probably belongs on rec.auto.tech, but since someone else 
| brought it up, 
| > I thought I'd offer my piece.  Anyway, the symptom is 
| hesitation just off 
| > idle.  Give it a little more throttle and it is cured, but it 
| persists as long 
| > as the the throttle is held barely open.  It is a feature on 
| the corsica 
| > (had the problem since new), may be a bug or feature on the 
| blazers, since 
| > they were used by the time I drove them.
| 
| Hmmm, 86 & 88 GM 2.8 V6?  Don't those have the infamous GM MAF disease?
| If so, you need to the update PROM that converts the EFI over to speed
| density.
| 
| -- 
| Jonathan R. Lusky                        lusky at knuth.mtsu.edu
| http://www.edge.net/~lusky/                 (615) 726-8700

Jon -- come again?  There is an update PROM that converts from MAF to SD?  I 
don't know if any of these vehicles are MAF or not, although I can check on 
the blazer tonight.  I'd appreciate more details on this "infamous MAF 
disease".

--steve