I couldn't begin to explain why it happens but two people on this same thread (both with 98 svt's) have noticed it, so I'm sure it is not being imagined. Also if you look at the TH fix under the common complaints section it states:
"For the SVT, or a car equipped with the SVT intake, the optimum hole size in the plug seems to be 3/16" or 7/32". For the stock intake, the best size seems to be 15/64". lose The addition of the throttle hange restrictor plug has been reported to also fix the Mr. Moose (see related section on this page) issue without using the Ford Moose "bagpipe tube/hoses."
