P0171-P0174 after plenum & T/B install
96 GT with complete PI motor swap, shorty equal lengths, o/r x, flowmaster cat back, trickflow plenum, trickflow 75mm t/b, k&n intake. TPS sensor was set at 0.999, battery was reset and car idle high for alittle then surge then idle at ~800 then idle rough then threw codes P0171 and P0174. Checked for vaccum leaks as this was the most common result when researched none where found. Fuel filter was changed during motor swap (motor only has 2800 miles on it). Injectors where also cleaned during motor swap; was wondering if anybody had any suggestions on what it could be causing the problem? Codes where cleared and car still idles slightly rough and surges very slightly and when the fan kicks on the car idles so low that it seems like it wants to die?
Any suggestion would be appreciated.