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Sometimes on really filthy throttle bodies, I've used a pocket knife to actually chip away varnish deposits. (I can hear the gasps of horror!) You could use a brass wire brush without any damage- go easy on the aluminum though.
You may not need anything special but if it's been awhile just keep at it till it's really clean. Plan on 2 cans of carb cleaner. Also it's good to have a metal pan, like an old cake pan or something to clean it into- the solvent makes a mess otherwise.
Definitely clean out the little brass nipples on the throttle body and make sure you can blow air through the vacuum line going to the flame trap. Speaking of which, replace that flame trap- it's only $2.50 for the kit. Just make sure you get a bent one or straight one- whichever you've got now.
When you're done and it's all reinstalled, make certain you can hear the throttle switch click just as it closes. Adjust the link rod slightly if needed to achieve this. Good luck with it!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K
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