I would say so. The EGR operates directly with manifold vaccum so when they sick open they can kill the idle. The car will run fine without it hooked up as it only functions during warm-up for emissions.
You may all so have carbon biulded up under it.It happen to me on a 73 Nova
I have the same problem. I believe the idle air control valve either needs to be cleaned or replaced.
Maf sensor check it they have a cleaner for it. Like 6.99 at auto zone
check fuel pressure regulator
If a 1989 Suburban hesitates when accelerating from 45 miles per hour, the carburetor might need cleaned. A clogging can cause surging and hesitation.
Get your accelerator pedal checked, I had surging problems for 6 months and Ford could not find the problem, they finally replaced the accelerator pedal and the problem went away. The throttle positioning sensor seems to wear out in the spot that it is used most around 1800 RPM
A 1994 Cadillac Deville that has an engine surging problem and is stalling out can indicate it is not getting enough fuel. The fuel filter may be clogged.
I found that a mechanic that used non Volvo transmission fluid caused this problem in my 2002. Once it was replaced with genuine Volvo transmission fluid it stopped surging.
I recently had this problem. I took it to my mechanic. First he said that there was nothing wrong because the diagnostics came back clean. I asked him to keep looking. He found that the overdrive mechanism was damaged and needed to be replaced.
the water was surging over the rocks
The most common cause of surging is a dirty air filter. EPA approved carbs tend to run lean causing the surge condition described. Main jet needs to be replaced with next size larger.
When a 1999 S10 is sluggish and surging with going up hills, perhaps there is a problem with the transmission. The filter might need to be changed, more fluid added, or it might need a complete overhaul.
Governor hunting or surging is a problem that causes the engine to constantly speed up rapidly and then slow down rapidly.