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no upper end power

Are you certain BOTH of them are working and that the connecting link hasn't come loose?

Steve
god i feel like such an idiot. i forgot about the conecting link. and guess what....that was the problem. Now would this have caused my P0171 (engine bank 1 lean) ? if yes thank god if not...many more probles to fix. stupid car hits 160000 KM and EVERYTHING goes wrong
 
P0171 (engine bank 1 lean)

P0171 (engine bank 1 lean)

P0171 (engine bank 1 lean)

I would guess vacuum leak, fuel pressuree, maf, or possibly an oxygen sensor
If it was the MAF code it should throw codes for bank 1 and bank 2. Fuel pressure should probably do the same because it is the same for both banks. I would check all the vacuum connections for a leak.
 
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