Go to www.jeepforum.com
. and search for 87-90 2.5L throttle body rebuild. He shows a complete rebuild kit for what he did. Its made by standard products so it should be available at any Napa store.
'87 YJ, 4.2L built and bored, 8" of lift, 8.8 rear, AX15/NP 231J, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...