98 150 4.6 P0174 code
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
Just a guess, a bad intake gasket on that bank allowing unmetered air into the engine. Try an unlit propane torch around the intake on that side. If you get a increase in RPM in a certain area, then you are on the right track. Good luck! 
Posting Guru
Joined: Apr 2003
Posts: 1,903
Likes: 2
From: Wyoming
What King Ranch says times 2. You can use carb cleaner too, just not as 'clean' as propane. If you get P0171 (the other bank) too then you might look at some other things like PCV hoses, cleaning MAF sensor.
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