I just got mine UIM and LIM cleaned and I had 35,000 miles at the time. We (Stazi and I) cleaned them, scraped the gaskets and reused them because the looked still in very good condition. He used brake cleaner and Xylene. After cleaning them we started it up, and man did it hesitate and then boof, black smoke. After warming it up a little, we shut it off and he used a mister bottle and sprayed cool water in thru the TB, having to keep in reved up so not to stall with no MAF or any of that connected. After spraying the water it really smoked up and got all of that gunk out. You might as well change the spark plugs to while having the UIM off. Hope this helps.
J.D.

1998.5 Silver SVT
Brullen exaust
off road Y
kkm
Aussie pipe
FRW
5% mirror
Cut shifter