Quote:
Originally Posted by radmlt
I cleaned them with throttle body cleaner whilst leaving them in place. ...
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(my emphasis)
That's not the best way to clean TBs. As others have pointed out (if obtusely), the gunk that you wash off the TBs is only moved to the manifold and combustion chamber. If there is enough crud on the TBs to have a big effect on performance, you could end up knocking a chunk loose that ends up in the combustion chamber, possibly scratching the walls or fouling plugs.