My car was running perfect. My battery was 5 yrs old and going dead after about a week. I installed a new battery and did not crank the car until the next day due to running late for appointments. I actually heard a pop in the exhaust when cranking the car and the idle was all over the place up and down. I thought maybe it was learning the TT chip. Went to back out and noticed a slight stumble, went about a block and the car was limping and light popping. Also the AFR was all over the place up and down. Could I have shorted the stock coil or module? I have a MAF Translator and 3.5 sensor. All I did was swap the battery but did not unplug the ECU cable. Orange Wire.