Replace the EGR VSV first, then the modulator. Since this is on a 5SFE (modulator gives it away), you're going to have a hell of a time trying to replace that VSV.Received an EGR Insufficient Flow error code on my 1999 Camry CE. Took to local garage and had the EGR valve and vacuum lines cleaned. Error code was reset and stayed away for two days. It then came back. Two different garages gave two different paths to fixing. The common item between both solutions was to replace the EGR Modulator Valve. I replaced this myself and reset the error code by removing the EFI fuse for ten minutes. The error code stayed away for two days (about 45 miles). One garage suggested replacing the EGR valve itself the other garage suggested replacing the EGR valve itself.
Any suggestions? Evidently the line from the bottom of the EGR valve to the engine block was heavily filled with carbon. I have limited tools and knowledge of working on cars, but think this is something that I can replace with help from the forum.