I have been having problems with my 05 zx3 starting. I turn the key and it wont start or it does but wont idle correctlly and black smoke comes out the pipe. If I rev the motor it comes back down to idle ok. Its not something that happens all the time, in fact its real ramdom. My car has less than 12,000 miles on it and I am the only owner. It's not driven hard and has been serviced at every interval.