I have an 85 Berlinetta 3.0 V6 with 70,000 miles. It was running great, then a couple of days ago it suddenly started running rough. The RPMs at idle were not off that much but they were fluctuating a bit more than normal. However, the car didn't seem to have any power. I could rev the RPMs up to 3,000 and it would barely go above 30 MPH. When I accelerated it went very slow.

After I got home, I went the next day to start it up and now it won't turn over, even after putting carb cleaner in the air intake. I replaced the fuel pump and filter 18 months ago and he Catalytic converter last July. When it changed it was so sudden it was like flipping a switch.