92 olds cutlass supreme. Replaced ECM, made sure numbers matched, used original prom. Car starts but surges at idles from 500-1500 rpm. Dangerous to put it in gear as the brakes feel hard and car lurches forward. Can rev to over 2000 and it smoothes out sounds great. But pressing gas pedal between surge speed and getting to 2000 rpm feels like no response - the pedal presses down but there is no response until 1/3 to the floor then it jumps to 2000+rpm and smoothes out.
Saturday, September 15th, 2012 AT 7:54 PM