help with EGR vacuum control

This car has worked perfectly up until this problem. One day I cranked her and we got about 1 mile from home and she just did not want to go. I did not want to walk so I continued to give her the gas. After about 4 miles all was ok except that I pulled over because of smoke. Many people stopped because they thought car was on fire( It was that bad). This was many months ago and it still does the same thing. It must comepletly cool down after doing it in morning before it will do again in evening. Also there have probably been 5 times out of 200 that the problem did not occur. Thanks to all for help!!