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Did you have a shop install the engine? If so take it back and tell them what's happening. If the oil light is coming on that's not a good sign, neither is the ticking your hearing if it's having that light. Check for vacuum leaks and use a screw driver to hear where the noise in coming from. The motor you got could be bad. It could be running lean from a leak or maybe the front O2 sensor might need replacing. We tend not to recommend putting another SPI motor in and usually point towards doing a zetec swap.