04 4.6 rough idle/ acceleration
I have a 04 w/ 4.6 4x4 XLT. It has begun running extremely rough at idle and while driving. It acts like it is misfiring. While accelerating the whole truck shakes and sounds horrible. The first code it threw was P0171 (lean bank 1). Made some repairs, still had the same issue, however its now throwing a P0174 (lean bank 2) code.
The following repairs have been completed with no luck fixing the issue: All coil packs replaced All spark plugs replaced Mass Air Flow Sensor cleaned Throttle Body cleaned New PCV valve Fuel Filter replaced Air filter cleaned checked for vacuum leaks use Lucas fuel treatment regularly Starting to run out of options and ideas. Just looking for some advice and a direction to follow. Thanks! |
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