Re: Great progress in car but having throttle position problem
Almost anytime you take a TB off, it's a good idea to go back on with a new O ring.
You only want to purchase a TB from car-part.com, otherwise you will be paying $500 and up for one.
I got my 74mm 3 years ago for $60 and have had no issues with it.
NOTE: the manifold opening is 74 mm, The OEM 68 mm is on there for marketing reasons.