fixed/tuned up the engine with new hoses, injectors, coil pack connectors, PCV valves, etc....well b/c I needed to see what length screw was used for the Air Regulator (they were missing on my TT that I just got and the replacement screws that I ordered happened to be the wrong length...they sent me the IACV size screws by mistake), so I decided to remove just the top one on my NA and that's when the issue started (really weird, right?)...I guess I could have shorted a wire/connector or something...but all those harnesses and everything are in perfect shape and have less than 1K miles on them.