HELP ...power loss dunno why.

[toddsterr44]

ok i had the whole motor redone by a shop. car runs great well did. i have about 600 miles on the new 7 bolt. i know should have put a 6 bolt in it. but anyways....this is what happened.

i have been throwing a fuel trim malfuncion code bank 01.
i go to the shop and get it turned off and it runs fine.
well the other day i got it turned off....ran fine all day. then all the sudden i got on it a lil bit in first one the way home shifted or w/e
thats when i noticed i was losing and gaining power. the car would jump in rpms sometimes and gain power. then i would lose power . kinda like i was misfiring or somethign. i dunno. a buddy said maybe an o2 sensor. but i dunno much about this car....someone ### help me out ###.

thanks.

 

[broken_eclipse]

my rear o2 is out and i dont have any problems like that. have you tried the basic tests like a compression test, leakdown, and just looking at the plugs?

 

[toddsterr44]

my oil pressure is up and everything it just sputters. like misfire...and when i idle im at like 0 rpms. no leakdown...its new motor. its something sensor wise or something i just dunnow what. mafs is bad maybe? or front o2? bank 1 is 1st cylinder? i dunno...should i change sparks?

 

[absolute_DSM]

Bank 01 is your front O2 sensor. If you have a logger, log your O2 at idle and make sure its jumping up and down.

 

[BringBackDSM]

Your 02 sensor only affects low throttle, and its really not even that noticeable. Atleast from my experience. Check your plugs and wires. Check for boost leaks. Like you said, it may be you maf.