98 f150 runnin bad @ idol

[geloandkam]

my 98 f 150 V8 4.6L "W" lost power and now has a bad miss. got codes po308(#8 cyl. missing[changed spark plug]) no help. code po171(lean bank one[replaced drivers side o2 pre cat])no help. code po174(lean bank 2[replaced passenger side o2 pre cat]) no help. Also replaced MAF. Checked coils they were ok. Plugwires ok. Runs well at 2000rpm drops to idol shakes profusely. Need help or ill have to take it to the dealer.

[iloveralphlauren]

Originally Posted by geloandkam

my 98 f 150 V8 4.6L "W" lost power and now has a bad miss. got codes po308(#8 cyl. missing[changed spark plug]) no help. code po171(lean bank one[replaced drivers side o2 pre cat])no help. code po174(lean bank 2[replaced passenger side o2 pre cat]) no help. Also replaced MAF. Checked coils they were ok. Plugwires ok. Runs well at 2000rpm drops to idol shakes profusely. Need help or ill have to take it to the dealer.

We had the same exact problem. Except we have the 4.2 V6. We found out that we had a leaky seal in the engine and it was leaking water into the engine.