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2002 Wrangler rough idle and bad miss

912 views 3 replies 3 participants last post by  808DanK 
#1 ·
A buddy of mine just bought a 2002 tj. It has over 200,000 miles on it but its in very good condition. It idles like it has a small miss but the longer it idles the worse it gets then it will finally die. When you crank it back up it starts and runs fine but slowly goes back to a miss then gets worse and dies. The previous owner had replaced the oil pump and oil pressure sending unit and the cam shaft sensor. we have changed the coil pack assembly and it has not made a bit of difference. We unplugged the camshaft sensor and checked the plug and wiring and found it to be good. We get a p1391 fault and a code for all the of the coil packs misfiring. (cant remember code numbers) Do we replace the new cam sensor? Any more ideas? Any help will be greatly appreciated. We did change spark plugs also.
 
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