Couple years ago the trans went out on my gtp, I finally got trans rebuilt and put back in case. While trans was out I had motor out and put new timing chain dampener and oil pan basket on motor. I put a 2500 stall converter in trans, bypassed radiator cooler for trans. Car wouldn't start before these repairs due to fuel pump p going bad after sitting for 1 year. I installed a AEM 320 lph pump. Also installed my ported supercharger housing with new pcv valve. After vehicle warms up I get a screeching noise in rear of engine after reading operating temp. Also my fuel mileage has dropped from 24mpg average to around 14.5mpg. My mass air is reading the same as my coworkers gtp. O2s is reading normal, my Lt ft is -11 and st ft is 0. Indication of running rich. Anyone have any idea what the cause is???
