New to the board, had my Check Engine light go on with 88. Checked the book and it says "#88 Purge Valve Leak". Looked in the Shop Manual and I know what it looks like. Checked the truck and no apparent leaks. Then tried the reset procedure and it does not clear. So...... is it "usually" the valve itself, or should I start going through all the lines with bubble solution? 93 NAS 110 with 91K Thanks to all in advance!