hello everyone. I've got a mk3 escort turbo and up to now it seems to have been running sweet with a bottom end rebuild bout 2000 miles ago. just over last couple of days (more so when bit cold still), engine has been very stuttery and driving with kangaroo juice, (if you know what i mean). Everytime i accelerate, after the kangaroo bit it makes a very loud bang out of the exhust tail pipe, then drives off like normal. Please could anyone tell me what this maybe. Thanks, Ben