2001 silverado no power help!!
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2001 silverado no power help!! - 7/11/2008 5:11:58 PM
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cj7deerslayer
Posts: 1
Joined: 7/11/2008
Status: offline
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i have a 2001 5.3 4x4 silverado auto trans.
this problem cam on very suddenly.
the other day it would shudder going up a hill and gave p0171 and p1074 codes / running lean.
i cleaned the mafs and throttle body now it runs even worse
idle is fine but the engine shakes a bit on start up
i disconnected the mafs with no change
truck runs fine on level ground under light acceleration. but going up hill or hard acceleration the engine either chokes down and tries to die or just wont rev up. occationally it will rev up a bit but not enough to get it up a hill at over 25 mph.
after cleaning the mafs and tb the service engine light went off, but still runs very poorly.
there was a fuel pump installed at the dealer where i bought it in march at least according to them. they may have put in a used on for all i know.
any ideas?
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