Off-idle stumble resulting from ported EGR

[Gordon Couger]

:Since this seems to be the time for EGR-related correspondence, has 
:anyone come up with an effective method for eliminating the stumble 
:that seems to be normal for GM engines with TBI and port-controlled 
:(not PWM controlled) EGR??  I have had three such engines, a 2 L and 
:2.5 L four and the 2.8 L v6 and they all exhibit the same faltering 
:just as the throttle place goes off-idle. It seems as if the engine 
:just can't cope smoothly with the rapid dilution of charge that occurs as the 
:throttle plate uncovers the EGR port in the TBI.

:Disconnecting the EGR solves the problem but is obviously NOT a viable solution.

While rather inelagant how about installing valves that momentarily
disconnects tha ERG valve.

Making the mixture a little richer as it comes off idle might help. The 
problem sounds just like a worn out accelerator pump in a convential
carberator.

Gordon