SOURCE: Jeep Hesitates. P0303 code
Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.
SOURCE: VACUUM HOSE DIAGRAM FOR 1988 JEEP WRANGLER 4.2 I6?
here is a link with all the vacum diagrams for your jeep. hope it helps.
http://www.autozone.com/addVehicleId,1076002/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528008ab9d
SOURCE: 2003 Jeep Vacuum Diagram
THERE SHOULD BE A EVAP/VACUUM DIAGRAM UNDER THE HOOD ON A WHITE STICKER. SOMETIMES THEY ARE ON THE BOTTOM SIDE OF THE HOOD ITSELF. I HOPE THIS HELPS. PLEASE KEEP ME POSTED THANKS FOR USING FIX-YA AND FOR AN HONEST RATING/COMMENT. GOOD LUCK
SOURCE: 2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder
Plug, plug wire, plugged or open fuel injector. are the most likely.
SOURCE: serpentine belt diagram
Around the outside of power steering pulley,under idler,over a/c comp,around alternator,over fan pulley, around crank pulley, over water pump. The backside of the belt contacts the idler, fan and water pump.
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