I looked back in the forum and saw "eddie20890"  was have basically the same problem last year that I have been fighting for two years now. I would like to take it a little farther. I have replaced the EGR Valve, the Vacuum Solenoid, ECM, Injectors(this make the car run great again) Plugs, plug wires, made sure the exhaust was clear, had a total cylinder check, vacuum is in spec. The ECM I used as a replacement was a rebuild from Advanced Auto, The Vacuum Solenoid was a compatable type sense a new one for a 91 L98  is impossible to find. I drive the car from anywhere to 25 to 300 miles and up pops Check Engine Soon, (Code32 EGR recirc system) Shut it down for a few minutes the Check Engine Light goes away but the issue does NOT. I need Help badly.

hey mike, i have been having that problem for about the same amount of time as you. you can't take it any further than i have been as i did everything that you have done. the only thing i did that you didn't mention, was i even went as far as pulling off the intake and making sure that was clear too.

Perhaps the replacement solenoids are simply not correct, or calibrated properly. Installing your old one, Dave, prolly worked for a while until it got really hot, or something in it that stuck the pintle of the solenoid.
Just throwing idears out. It may be possible to dis-assemble the solenoid, and clean it....

don't know about not being correct, just as i can't say old one is bad. don't think it can be taken apart either. it's just one of those stupid annoying things that is going to be a pain to find the problem.

I am not giving up finding the problem. Maybe the solenoid I use is not capable because I just took someone word from another web sit that it was. There is an aftermarket supplier Standard Motor Products that had their part # VS35 listed but it is no longer available. I will try to contact them to get the specs (voltages, pin outs etc.) or what they have that is capitable. I plan on driving this car from northern Michigan to Florida this fall and would like to go in confidence.

Have you used a hand held vacuum pump ( Mighty Vac ) and pulled a vacuum on the EGR valve while the engine is running. W/vacuum applied should run very ROUGH and/or cut off. That's a fairly basic/early diagnostic check you've likely already done----didn't see that mentioned so I had to ask.

I have not done exactly as you described but using a vacuum pump and  pulled a vacuum on the egr valve and then observed the diaphram movement with a mirror showing the valve is functioning like it was suppose to. This should give me the same results but I can try your method also. I assume this check is for the functioning of the egr valve. Thanks

By checking this way with the engine running you'll be able to confirm that there is no blockage or leaks in any of the passage ways between the exhaust side and the intake side of the EGR system---if the engine runs rough and/or cuts off w/vacuum applied at idle that's ok/normal. If the idle doesn't change or changes very little--you likely have a blockage--either on the exhaust or intake side.

Thanks Vaughn, Check it out  as you described and found everything works as it should. However I had one of the best mechanics in my area review this problem, he went thru the car thoroughly and every tihing was fuctioning properly. Then I drove the car for about 50 miles and quess what, the check engine light can on. And the good old code 32 re-appeared. He suggested since a new original solenoid is not available to see if there is any out there who has replaced the egr valve and the egr solenoid valve (not original) what combination do you use that was successful. i.e. part #s and supplier because some aftermarket supplier say they have the egr valve but it is not specific to a corvette. or calibrated properly to the soleniod. In the mean time the car runs great but the light is an annoyance.

I went to the Advance Auto website used their "search" for EGR solenoid for a '91 Vette came up with part #214-565 (no picture) they call it--- AC Delco SPRING ??? -----however the description says  "2 Port Vac.--2 blade terminal"---sounds like a solenoid to me. Might be worth trying Advance again and using the part #---be worth a try any way. GMPartsDirect.com still lists the EGR valve one for auto and one for manual trannies.